How's this, then?:
Spell Focus [General]
You are especially adept at spellcasting.
Prerequisite: Ability to cast 1st-level spells.
Benefits: Add your synergy bonus from having ranks in Spellcraft to your caster level checks. This also affects the numeric effects of a spell (such as damage, duration, number of targets, etc.)
Special: Having high ranks in Spellcraft garners a higher synergy bonus. For every 20 ranks above 5, increase the synergy bonus granted from Spellcraft by +2 (i.e. +4 at 25 ranks, +6 at 45 ranks, etc.). For example, as a 2nd level cleric with this feat, Natalie gains her synergy bonus of +2 to her effective caster level for having 5 ranks in Spellcraft. At 26th level, Natalie gains a +4 synergy bonus to her effective caster level for having more than 25 ranks in Spellcraft.