In regards to sorting, it doesn't automatically refresh. So if you change ad groups (and the data isn't downloaded) it won't be in correct order. You'll need to click (I think it is 3 times) to get it to re-order. The 3 times is because there is descending, ascending, and some other "state" that I'm not too sure of.
I actually think the search feature (the box) and the advanced search are some of the best features of AdWords editor (behind the simplicity of copying/pasting ad copy)...
The sorting thing, while a pain, also stills has frequent bugs. Also it should be suggested that after the terms in an ad group which default alphabetically - the first click on the 'click' column should show the click descending first and not last. If you have say 200 term in an ad group who wants to see the terms with the lowest clicks first? Just doesn't make sense.