The REX viewer didnt have most of those glitches to me, and should know, i was there when you tested it ;)
The av generator really is great, it takes up the whole rendering screen, but that doesn't matter much as long as it's integrated in the viewer. The perfect generator would be inside a little window, but that would mean integrating issues between the SL and OGRE renderer, so i would suggest for the rex team to not do anything about it until they make their fully own viewer. As for bugs, the only one i could find was that that both the SL and OGRE renderer started getting very distorted after switching through both modes too many times. I like the room you guys left for the OpenLife GAS and Beta grids there, a nice hint for the future updates:)
Also, the "rendering of the landscape terrain is not very nice" because the terrain is not being textured with sim's destined textures, just with one other texture. I know the OGRE engine, it has a special system called a "terrain scene manager", which loads terrain from a heightmap and textures it real fast, plus auto-optimizes its' geometry depending on the camera position to increase rendering speed.
And yes, it does crash very often... i suspect this has to do with the fact that its coupled with the SL renderer, and because it can't use DirectX rendering just yet (devs reported a 50% increase in performance in a very early DirectX test).
The IK movement generator and using OGRE animations is a great feature too, but i could only get it to work on a standalone server, not OpenLife.