Version:            (using KDE KDE 3.4.0)
Installed from:    RedHat RPMs

Here's something that would make Kate more useful: An "undo within selection" feature.

Basically, it'd allow a user to select text, hit "Undo within selection," and the undo would only affect the selected part of the text.

I'd use this feature a lot while editing code. Lots of times, I'll make a change to something toward the top of the document, then make a change to something at the bottom of the document, but then I'll want to undo the first change without undoing the second change. Currently, in this situation, I'll copy-and-paste the second change into a new document, then hit "Undo" several times in the original document until the original changes are undone, then copy-and-paste the second change from the new document back into the first document. That's quite laborious and error-prone. It would seem easiest, usability-wise, to be able to select the code at the top of my document and hit "Undo within selection."

I suspect this would be a popular feature -- and I can't think of any other text editor that has it. It'd be another way for Kate to prove it's the best editor around. :-)