No, there won't be any stratum problem using cgminer with Raspberry PI.
The fixing of custom ethernet controllers' problem is still under way though.
Friedcat,
Is the cgminer code available somewhere? I would like to see an X48 driver for the RPi if it is already made, even if it isn't completely finished.
Also with regard to the ethernet controllers: Is this something you expect to have done soon or is it going to be more than a few weeks? Not asking for some promised date, just curious about roughly when it might be done.
Thanks.