It's not a bad idea at all. How about something like this?
STR + CON/2 affects HP Bonus, Paralysis, & Constriction Saving Throws.
STR + CHA/2 affects Melee Attack & Melee Damage Bonus.
CON + CHA/2 affects System Shock, Disease, Energy Drain, & Poison Saving Throws
DEX + INT/2 affects Breath...