onion-router on ubuntu is not applied system-wide, right?

I just tried following:

I installed Qt Mobile Hotspot on N900, with the idea to get access to my wifi while onion-router is apllied system-wide...... then I access with my ubuntu the hotspot on N900.......

Didn't work... Qt Mobile Hotspot wants a gprs connection, and I want it to use my home wifi........

looking for a workaroud or other possibilities