two questions
first can you take quicken spell like ability for each of the Sp Arcane archer abilities, like imbue arrow or seeker arrow ?
If yes whats the caster level to calculate what level you can do this ?
thanks
No. QSLA has a requirement that those arcane archer abilities never actually qualify for. The Affected SLA has to duplicate a spell. Those AA SLAs modify the AA's actual spells.
The creature can only select a spell-like ability duplicating a spell with a level less than or equal to 1/2 its caster level (round down) – 4.
Frankthedm points out why it will not work in this case. Other answers to the question:
1) Your GM has to approve taking the feat to begin with (as it is a monster feat).
2) Most of those abilities make specific mention that it takes a standard action to perform the full thing - shooting an arrow is not a spell-like ability, so it doesn't make sense for it to be quickenable.
3) The most recent (5th printing) errata has an answer to what spell level it should be considered.
oh well the only reason I considered it was after looking at a Magus Myrmidarch / Arcane Archer and finding it not really combining as well as I would have liked.
meh maybe Summoner Synthesist / Arcane Archer instead