Weasel meant getting Vavoom to run in the first place, since it has so many bugs preventing it from running comrtably. Tough I've never encountered them. Vav was always a stable port for me
Anyway, 3d slopes and 3d floors in Zdoom would satisfy all my Zdooming needs when it comes to acrhictecture. Sadly, I doubt it will be done soon (if at all that is). Vavoom uses Quake's renderer for Doom. Getting slopes and 3d floors to Zdoom is not that hard but making the engine render them correctly is AFAIK the biggest current problem.