I still haven't found a working solution, but thought to add another option to this thread.

EventGhost is a free open source automation tool for Windows. There are quite a few plugins for it that add support for various remote control units and other devices, as well as plenty of ready made macros for application control (including foobar2000). There is also a neat Webserver plugin (see example configuration).

Unfortunately the web browser in OS 2007 HE works differently than Firefox in Windows, for some reason doubling each command sent to EventGhost.