I'm not sure what your USB remote is, but you could have a look at Girder or uICE. Girder is freeware, while uICE is shareware, their features are pretty similair, however you'll have to set up your own set of commands for BS Player using Girder, while you can download a set for uICE. There are plugins for a lot of other programs available for Girder though.
I'd check to see if your particular device is supported by each, I think they'll both support pretty much anything, but you may need to set things up yourself if no one has written a plugin for your hardware before.
Girder is available at
http://www.girder.nl/
You can download a time limited copy of uICE from
http://www.mediatexx.com/
I have a Creative Live Drive IR, which is supported by both, and am looking for advice on remotely controlling BS Player with Girder, or if anyone has written a plugin for Girder that would be even better!
:D