I don’t have any scenes built up around the arc at the moment (but I do have an non-pushbutton arc2). What kinds of things are you trying to accomplish?
The description of the ARC inputs and outputs can be found here (if you haven’t found it already):
http://monome.org/docs/aleph/ops/
The ARC into a ROUTE into 2-4 ACCUM operators is immediately where I’d go if I was after building up controls similar to the built in encoders.