Changing spell like abilities to require verbal and somatic components

[Darg]

It just seems extra work, without any gain.

The main worry I have is if there are any weird consequences apart from "facing creatures with spell likes is slightly easier now".

They can't use their SLAs in a grapple now as it requires somatic components. They can't be cast in a silence spell. You can now make spellcraft checks to identify it.