Scratch, did you bother doing a search of this very forum?
Here is a quote from a sticky post in the UO Tech forum. In this post he clearly states at the bottom "Fine tune the timing...", meaning that if you get it just right, you will get results like that of which you speak. Not only is it a UOA macro, it is totally legal because of that.
Read on...
"Is there a way to toss Greater Explosion potions in UOA?
Actually, yes if you’re willing to invest a few minutes of time following these instructions (reposted from Alchemists Forum and reformatted slightly):
Responses to this are for 1, 2 or 3-bomb setups. Instructions are basically the same, except for 3-bomb. Each is marked as to what it will do.
Go to the UOA macro directory which should be a path something like:
C:\Program Files\Tugsoft\UOAssist\UOA-Settings\[account name]\[shard]\[character]
In here will be some files named UOA-Macro##.cfg where ## will be a number 1 – 16 to represent a macro slot.
In Windows Notepad, open an existing macro file or plan on saving as a new one.
Depending on which bomb macro you want, select the text from below – starting at “Locked=0” to the last ##RY=999 line.
Press CTRL-C to copy it, change to Notepad and CTRL-V to paste it in.
If the cfg file was already existing, do File  Save from Notepad.
If this is a new file, File  Save as and supply a correctly formatted name for the file (UOA-Macro##.cfg where ## is a 2-digit number for the slot).
3-Bomb setup:
You need two (2) inner packs/bags to do this.
Distribute the bombs evenly between your main pack, bag 1, and bag 2...
Next, go into your UOA macros and go to the 3 bomb macro...
Click on the 4th line of the macro and hit "Load Item Bag" and dbl-click/open Bag 1.
Now on the 7th line, you'll need to load bag 2...
Then on the 13th line, load bag 1 again..
And last, on the 16th line, load bag 2 again...
And thats it. You may have to adjust some of the pauses in the macro, but thats about it. The 2 bomb is roughly the same, except you only need one bag instead of 2 and you'll load that bag on lines 4 and 10...
SUGGESTION:
Fine tune the macros with timings, etc by using NPC lesser potions. It’s cheaper and SAFER!
Single-Bomb
-----------------------------------------------------------------------
[**Macro Data**]
Locked=0
MacroName=Single Bomb
0MT=8
0ED=0D0F26F685
0EDSZ=5
0CK=32
0WE=3343
0RX=999
0RY=999
1MT=1
1ED=D902194EE0090203040501FDFCFBFA01020304
1EDSZ=19
1CK=130
1RX=64198
1RY=64477
2MT=4
2DV=3200
2RX=999
2RY=999
3MT=8
3ED=0D0F26F685
3EDSZ=5
3CK=32
3WE=3343
3RX=999
3RY=999
4MT=17
4ED=D902194EE0090209908E2C16E24421010AFB45
4EDSZ=19
4CK=413
4RX=3
4RY=999
5MT=4
5DV=500
5RX=999
5RY=999
-----------------------------------------------------------------------
Double-Bomb:
-----------------------------------------------------------------------
[**Macro Data**]
Locked=0
MacroName=Double Bomb
0MT=8
0ED=0D03C784ED
0EDSZ=5
0CK=45
0WE=3343
0RX=999
0RY=999
1MT=1
1ED=D90211C7FE4F0203040501FDFCFBFA01020304
1EDSZ=19
1CK=236
1RX=64340
1RY=61930
2MT=4
2DV=1200
2RX=999
2RY=999
3MT=3
3ED=0D07CC40C8
3EDSZ=5
3CK=242
3BD=417789C8417789CC4177893541778929
3BDSZ=16
3WE=3343
3RX=999
3RY=999
4MT=1
4ED=D90211C7FE4F0203040501FDFCFBFA01020304
4EDSZ=19
4CK=236
4RX=64340
4RY=61930
5MT=4
5DV=1700
5RX=999
5RY=999
6MT=8
6ED=0D03C7744E
6EDSZ=5
6CK=63
6WE=3343
6RX=999
6RY=999
7MT=17
7ED=D90211C7FE4F0211C7FE4F024904E901027B30
7EDSZ=19
7CK=630
7DWE=134217728
7RX=64414
7RY=62034
8MT=4
8DV=1000
8RX=999
8RY=999
9MT=3
9ED=0D07CC40C8
9EDSZ=5
9CK=242
9BD=417789C8417789CC4177893541778929
9BDSZ=16
9WE=3343
9RX=999
9RY=999
10MT=17
10ED=D90211C7FE4F0211C7FE4F024904E901027B30
10EDSZ=19
10CK=630
10DWE=134217728
10RX=64414
10RY=999
11MT=4
11DV=500
11RX=99911RY=999
-----------------------------------------------------------------------
Triple-Bomb:
-----------------------------------------------------------------------
[**Macro Data**]
Locked=0
MacroName=3 bomb
0MT=8
0ED=0D0739792F
0EDSZ=5
0CK=182
0WE=3343
0RX=999
0RY=999
1MT=1
1ED=D9021163FCE50203040501FDFCFBFA01020304
1EDSZ=19
1CK=353
1RX=64196
1RY=64480
2MT=4
2DV=850
2RX=999
2RY=999
3MT=3
3ED=0D07E56071
3EDSZ=5
3CK=12
3WE=3343
3RX=999
3RY=999
4MT=1
4ED=D9021163FCE50203040501FDFCFBFA01020304
4EDSZ=19
4CK=353
4RX=64196
4RY=64480
5MT=4
5DV=850
5RX=999
5RY=999
6MT=3
6ED=0D07E56014
6EDSZ=5
6CK=-15
6WE=3343
6RX=999
6RY=999
7MT=1
7ED=D9021163FCE50203040501FDFCFBFA01020304
7EDSZ=19
7CK=353
7RX=64196
7RY=64480
8MT=4
8DV=850
8RX=999
8RY=999
9MT=8
9ED=0D073979EC
9EDSZ=5
9CK=180
9WE=3343
9RX=999
9RY=999
10MT=17
10ED=D9021163FCE50203040501FDFCFBFA01020304
10EDSZ=19
10CK=353
10RX=64196
10RY=64480
11MT=4
11DV=850
11RX=999
11RY=999
12MT=3
12ED=0D07E56071
12EDSZ=5
12CK=12
12WE=3343
12RX=999
12RY=999
13MT=17
13ED=D9021163FCE50203040501FDFCFBFA01020304
13EDSZ=19
13CK=353
13RX=64196
13RY=64480
14MT=4
14DV=850
14RX=999
14RY=999
15MT=3
15ED=0D07E56014
15EDSZ=5
15CK=-15
15WE=3343
15RX=999
15RY=999
16MT=17
16ED=D9021163FCE50203040501FDFCFBFA01020304
16EDSZ=19
16CK=353
16RX=64196
16RY=999
17MT=4
17DV=500
17RX=999
17RY=999
-----------------------------------------------------------------------"
I hope that helps. So, rather then complain, just do it yourself until they change it.
To be honest, there is another UOA macro that works even better. It fires a pot each time you hit the button, AS FAST AS YOU CAN HIT IT. All of this done with a Origin Approved Third-Party App, UOAssist.
But I'm not telling. You'll have to get by with the one above, or figure out how to use UOA to its fullest. Good luck, and happy bombing to you!