I don't think the Actor Value editing thing is a bug; I think they just wanted to prevent people from adding new Actor Values (why they would is beyond me though) and simply flagged the important data fields as "display-only". Doing that in any Windows GUI app is as simple as changing a boolean. Seems like a really half-assed way to disable it, but you'll notice all the important fields are disabled.
While that's true, I seriously doubt it's deliberate. There's absolutely no reason to disable it at all, and even if they wanted to they would have done it in a more elegant way (i.e. one that doesn't permanently break your current plugin).
The disappearing static (with LOD, I presume) meshes is now officially my most-loathed bug. Creating a castle requires me to constantly exit the CK and reload so that I can see what I've already done. It's a monumental pita.
I agree. It's seriously annoying. It also happens when LOD view is turned off however.
Any bugs regarding the Heightmap Editor I'm probably not going to include as Bethesda have stated that it's not officially supported in the CK.
Keep the bugs coming guys!