Dude, dont ask for it, that could get ugly, but tell her that you want a 1 hour foot massage, there are "moves" that every massage therpist I've even gone to do that pretty much tickle like crazy.
There are certain reflexology techniques that involve her fingertips and your toes, pretty damn sweet if u ask me!!!!
Alot of them like to talk and want feedback...you can slightly giggle when she does your feet, and she'll most likely say "Oh does that tickle?" Which is your opening to some tickle dialogue. You can say "Im not normally ticklish, so feel free to do it again" or something.
Then again, it depends if youre actually going for pain relief (stiff back/shoulder) but most likely youre not going for that. Just be careful not to chub up if ya feel me...thats probably a deal-breaker.
Usually female massage therapists will come out and say "No sexual stuff, etc..." and get it out of the way. Which is cool because us ticklephiles dont really want sex, do we? I still dont know if this is a blessing or a curse!!!
BTW, I've never got a pedicure that DIDN'T involve me being tickled!!! Its all about money well spent.