I have been doing this. I give GPU cycles to Folding At Home, and CPU cycles to OpenPandemics. I think of it as not putting all your eggs in one basket. Everyone should win.

It has its own pecularities, which are a refreshing change from the BOINC pecularities. You don't have to worry much about running out of work, and they download a new work unit just as the old one is finishing, so there are no buffer problems.

I run both on all my machines, both Windows and Ubuntu. I use Folding on the GPUs, and then delete the Folding CPU slot (which they start up automatically). That way, I can run BOINC projects on the CPU. And I reserve a CPU core in BOINC (by using the "Use at most ___% of the CPUs" setting) in order to support the GPU, usually with a single CPU core though you can do more if needed.

I have been doing it for years/decades.

Do we have any idea on when or if a statement will be released giving indication as to the day of the first GPU WU deployments?