I am sure this question has been asked a zillion times here.
What are the pros/cons of agencies vs. independents.  I am looking for something very specific, not usually mentioned in reviews.  I am afraid if I call up an agency, and ask whether the girl can provide X,Y, and Z, that they'll hang up because of "rude" talk, whereas the independent may be a bit more tolerant over the phone to hear me out. What IS the best way to make sure that the provider is willing to provide what you want? (Would appreciate hearing from the gals on this one)
Thank you.

I answer questions about the ladies I have reviewed, I am sure other guys do likewise.

Starting out you want to go with an agency. Only go with well reviewed woman at the agency.  Then when you get your feet wet like me then you can move on to INdependant.  Seems like they are little cooler.

specific sex acts is LE.

Seriously, no good provider will put up with that and if a provider is naive or careless enough to do the same, LE will soon be all over her.

Use the reviews.

Let that be your mantra.

Have you tried posting the request to your local board? That way, the provider can see who you are and either post or message you if they offer what you are looking for or know somebody who does... they can also get a hint as to whether you would be sombody they might want to see before offering.

You might also try a post in the ISO forum - just don't forget to specify what area you are looking for the service in.

Specifically asking about a certain act is not a good idea, no matter which you choose. Perhaps there is some way to phrase your inquiry that doesn't mention any specific act though?

General pros/cons of agency vs independent has been well-covered here - use the search function and you'll get lots of opinions if you are still unsure in that regard.

And now I'm curious... what is this service that you are after that you wouldn't be likely to find mentioned in a review??

If there's a provider out there that really wants to know, she just might get the secret out of me if she tries really hard