to answer both comments:
i've been working on a way to handle tabs but it's hard to find a solution that isn't half-baked due to the lack of info on tabs given by the os (there are no events or anything, just on a11y attribute that give info on tabs)
as for a scrolling layout, its possible, but does not fit that well with rifts layout, even thought you can get something similar using trackpad swipes to switch between workspaces
