I haven't tried those projects but I'm using a little app called ThreadMaster that I found somewhere as boinc add-ons or something, and it works like a charm to block the cpu priority of several apps. I'm currently splitting boinc with dnet 50/50. (Except when pirates has work, then pirates get full cpu)
And a note for boinc projects, one has to set each of it's apps separatly in the configs with the registry file.