It would be awesome if we could have auto complete/close on created xml tags as well as CDATA tags, I work with xml files on weekly basis as flat data files both for javascript/jQuery and php. Currently I move to FlashDevelop to do these things on more advanced xml files (which means downloading/exporting the file, edit and then upload/importing after editing).
If you don't want to install flashdevelop this is an example of what I want.
Tag auto complete
After adding the closing bracket (>) <exampletag> becomes <exampletag>|</exampletag> with the caret ready to enter data
Closing the tag with /> (<exampletag/>) would not trigger the auto complete function
CDATA
<![C would bring up auto suggest <![CDATA[]]> and <![CDATA[|]]> with caret in edit position
Code collapse would also be fabulous
These features would be a huge time saver for me and I hope others