I don't think it's a great idea to nerf skills NOT on their own merits, because the skill itself is too good, but because they might be a bit more powerful when combined with a Talent.
Hmm, maby you would rather balance a skill by skill. That doesnt work.
Maby you have missed an issue of Decaing touch + Healing spells, which is (unwanted?) way how to get irresistible damage for few AP.
Issue is that builds are about combination of skills and talents.
Therefore talent My precious is useless to all. There is no skill to boost. Talent elemental affinity is best for mages becouse of skills. If the elemental affinity says -4AP on elemental spell due to ground type - that is obvious combination of talent and skills which needs to be nerfed.
If we want to change guerilla talent which is most usefull for rogue-like clasess then it is wise to check realated skills and combination and balance. Guerilla need to be done a way to be available to more builds rather then locked to backstab dagger-man. At the same time it should not make Scoundrel OP due to skills combination.
Talents boost and skills must be considered in combination. That is same like bug touch spells with range 5meters do to Far-out-man talent. Touch spells need range of dagger, no matter what. Spellcaster need to touch the target to make it work. Touch spells are touch and should be balanced as a group where trade-off is - better damage(status chance) but close to enemy. That is the great example of mistake combination of talent boost and skills.
