Teshadael: I usually don't use ckVWM, but AFAIK, it has no interaction with popup2's !popuptasks.
Multiple taskbars can be done, with xTaskbar anyway, but I know of no way to differentiate the items by VWM.
BTW, I mean doing things like the common linux desktop environments can do, where the tasks can be separated by workspace. Not having a taskbar native to each workspace, but still having some way of separating them. It would almost certainly require VWM & taskbar module authors to get together on it.