create your own ear and embed jBPM in it. So simply do not share the jBPM libs between processes but give them their own libraries etc...
I've followed this to the letter twice: http://jboss.org/community/docs/DOC-9545
And after I deploy (successfully), I try to hit the jbpm console and get:
Error loading jbpm configuration: null
I see someone else may have been having this issue (I'm not using seam http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4169756#4169756)