I know this has come up a few times recently, but I'm not having any luck finding the older posts. If there's already a solution in the works, ignore me. Or point me to the right post.
It really is annoying when you're trying to edit some tags and every time you make a change that eliminates a column browser entry, it sends you to the top. I think it would be much more user-friendly to go to the next entry in the list. I think going down the list would make more sense than going up, since people are more likely to be making their way consecutively down the list making changes, but that's a relatively minor detail.
(Current example: I have some genres that are being read as strings and in order to fix them, I find the entries in the column browser, then go in and quickly resave each track in the main panel. I'm just working my way steadily down, and don't want to go back to the top.)
Edit: Tangent, but I managed to solve this particular problem quickly using the reencode tag command from Additional Tagging & Reporting Tools. I think the adjustment to column browser behavior would still be helpful, though.