Get a stack of supernovas and record the macro as normal, but do not change it to "use item type", it should work then, the problem is you'll have to remember to reset it if you happen to die or run out of supernovas from that stack.
I'm pretty sure your strength potion macro would also need to be changed, so that it doesn't confuse the two potions and use the wrong one as well... it's annoying.
I guess we could be hopeful for this to be fixed in the next publish though, would be nice.