Spellweaving can benefit any sort of character. Warriors dont need as much skill to benefit however. Spells like natures fury, attunment and gift of renewl are amazing. The draw back to spellweaving however is the large mana cost. A warrior if hes human can get 5 or 6 spells for free with the jack of all trades. So you can do any warrior template you desire. Sure you will fail a bit but it takes 0 skill to cast these spells. For mages however the spellweaving can be very strong. My arcanist runs this template.
120 magery
120 eval
120 med
120 spellweaving
120 resist spell
80 poisoning
40 chiv
This is a rather odd template i know, but its great for area control (spawns) and peerless. The area effect spells (essence of wind, thunderstorm and wildfire) are great in wraith form at champs. I use a +30 necro jewelry set and ossain grimore to get into wraith. I do however also pvp with this guy a bit (Nessecity if raided at spawn)
My buddy runs a 7x gm necro mage weaver, his template is something along the lines of this
100 necro (105 with tali)
100 ss (110 with tali)
95 magery (120 with tome of lost knowledge and alcemist bauble)
110 eval
100 spellweaving
100 resist spell
100 med
A tamer template i would imagine looks like this...
120 taming
120 lore
100 vet
120 med
120 mage
120 spellweaving
Pretty much spellweaving can be added to anything. It will help any template you can come up with...
A big issue if you cant get into wraith will be mana, Spellweaving eats mana. I suggest if you arn't going to be using wraith (or lich form for that matter) to go 120 med and possibly some focus. Weapon skill on a pvm mage isnt very important, if you find you get hit a lot use a mage weap. My mage runs staff of magi and slayer book when applicable. If you find you do a lot of peerless try to buff up your sdi, that word of death will hit big numbers.(Always cast arcane empowerment before word of death too
)
I will say this about spellweaving however. If you play solo a lot it's effective but not incredible. With a level 6 focus it is incredible. The effects, area, damage, duration of all spells increases so much. Once you get a level 6 focus you wont want to play without one.
I hope i was of some help, spellweaving is a fun skill and i highly suggest it for any character. Warriors benefit from 'weaving but i belive Mages are the way to go.