A lot of their stuff does have the odd bit of tickling in it, although considering the number of customers they must get for their mainstream bdsm material I doubt they would see much point in catering for such a specific kink. We aren't actually that big as a community, particulalrly if we are compared to pure foot fetishism and I don't think (correct me if Im wrong) they have bothered making a site exclusively for that. They seem to include quite a variety of fetishes into their more general material (particularly hogtied.com) but I don't think they would really specialise in a field where there are already a number of competent and professional producers, it wouldn''t be worth their time.
Of course I'd love it if they did, combining tickling with their style of nudity, tight bondage and forced orgasms would truely be something to behold.