My wish is maybe not so useful... We are creating new OS for C128. In tests is first VICE, after comparing emu-bugs and real-bugs we fix known and then begin test on real machine only. Our OS is using Multiscreen GUI... VIC and VDC together.
If is possible and if you mean that it's not useless, create option to record video of both screens starting both at same time to two separate files...
I mean that's not very useful before we release first beta-testing version, but for question we don't pay anything.
Other useful option can be using one screen for VIC and VDC with "software switch" C1084 monitor like... or other monitor with Component/RGBI switch.
Many thanks for reading it.