Clarification on SLAs

[thestrongangel]

Just to clarify, I have not noticed anywhere where this has been explicitly set out, and as a result I have been rather confused.

1) Spell like abilities granted by either your class or class feature, i.e. a cleric domain or wizard school, can be modified by what abilities? I have had conflicting answers from GMs and wanted to clarify this.

Examples:

Summoner's Summon Monster SLA that functions when no eidolon is out.
Wizard's Evoker school Force Missile SLA
Cleric's Magic Domain SLA

Are there any effects that can modify these SLAs? Feats, class abilities, magic items? If so, can you cite for me where this is allowed so as to be able to present it to a GM for clarity sake.

[Sarta]

Bestiary 1 has some good information about them -- check out the Universal Monster Rules and monster feats sections.

[Mystic Lemur]

Sarta wrote:

Bestiary 1 has some good information about them -- check out the Universal Monster Rules and monster feats sections.

None of which are legal in PFS, which is the section this was originally posted in. If this really isn't a PFS question then please disregard.