Spell-Like Abilities: Usually, a spell-like ability works just like the spell of that name. A spell-like ability has no verbal, somatic, or material component, nor does it require a focus. The user activates it mentally. Armor never affects a spell-like ability's use, even if the ability resembles an arcane spell with a somatic component.
A spell-like ability has a casting time of 1 standard action unless noted otherwise in the ability or spell description. In all other ways, a spell-like ability functions just like a spell.
Spell-like abilities are subject to spell resistance and dispel magic. They do not function in areas where magic is suppressed or negated. Spell-like abilities cannot be used to counterspell, nor can they be counterspelled.
If a character class grants a spell-like ability that is not based on an actual spell, the ability's effective spell level is equal to the highest-level class spell the character can cast, and is cast at the class level the ability is granted.
We were looking under the wrong entry as this is much clearer that it works just like spells and functions just like a spell. If so shouldn't it benefit from the feat?
And if I also found confirmation from the lead designer:
http://paizo.com/threads/rzs2k75q?Round-2-Rules-Questions#9
Quote:
Andrew Betts wrote:
Can Augment Summoning also affect monsters summoned through this Spell-Like Ability?
Yes
Jason Bulmahn
Lead Designer
Paizo Publishing
The answer was a clear yes, no ifs no buts.
Summon Monster I (Sp): Starting at 1st level, a summoner can cast summon monster I as a spell-like ability a number of times per day equal to 3 + his Charisma modifier. Drawing upon this ability uses up the same power as the summoner uses to call his eidolon. As a result, he can only use this ability when his eidolon is not summoned. He can cast this spell as a standard action and the creatures remain for 1 minute per level (instead of 1 round per level). At 3rd level, and every 2 levels thereafter, the power of this ability increases by one spell level, allowing him to summon more powerful creatures (to a maximum of summon monster IX at 17th level). At 19th level, this ability can be used as gate or summon monster IX. If used as gate, the summoner must pay any required material components. A summoner cannot have more than one summon monster or gate spell active in this way at one time. If this ability is used again, any existing summon monster or gate immediately ends. These summon spells are considered to be part of his spell list for the purposes of spell trigger and spell completion items. In addition, he can expend uses of this ability to fufill the construction requirements of any magic item he creates, so long as he can use this ability to cast the required spell.
After the session on Sunder I went back and did some digging. Turns out I uncovered a few things on SLAs and confirmation that it should work only in that situation.According to the PRD/ Core rulebook (Under Magic/ Chapter 9 - Magic):
Spell-Like Abilities: Usually, a spell-like ability works just like the spell of that name. A spell-like ability has no verbal, somatic, or material component, nor does it require a focus. The user activates it mentally. Armor never affects a spell-like ability's use, even if the ability resembles an arcane spell with a somatic component.
This still says: Like a spell, but not a spell. doesn't say what exactly makes it a spell. It does not tell us if feats that say "spells" affect it, or abilities. Unless it is interpreted as: it is exactly like a spell minus verbal, somatic, focus and material components.