I've got a store editor.
http://imagemodserver.mine.nu/other/...toremodder.zip
Mainly because it is a pain in the *** to renumber all those things manually.
A component editor would be worthless tho. You'd have to do just as much typing and it would be a lot of work to write for no benefit.
Just Copy-Paste an existing component, and change the fields... easy as pie.