Well, I have upgraded to Live 8, but I have Scope 4.5 on another PC, so this might not apply... Anyway, in spite of some minor problems with v.8 (especially when opening v.7 projects), I have had no issues whatsoever with using and routing multiple ASIO busses between both machines or within Live...
...and risk bonking the now 8-year stable drivers that Samplitude is happy with...
hmmmm....may have to do some more tests first, but I guess I can always revert. So far tonight things seem to be OK using one master ASIO channel.
I'm only using Live for a multimedia development project I'm working on up in LA, and I don't want to disrupt anything on the main DAW while I'm working on a CD and other personal projects.