Of course, that would be great
OfflineList 0.7.3 beta2 has many flaws, and is a dead project.
What would be great is making a GUI for that Dat.
What would be even greater, is making a GUI for all existing Dats without limitations (image number, tags number, etc.)
A program which would allow new added xml tags if needed, not predetermined ones.
If you don't know
NDSCRC I suggest you take a look, it's based on a similar dat (I included almost all info from the NDS offlinelist dat).
If you need more information about the dat or what could be useful in the GUI, we can talk about it in private.
Also, make a separate topic.
Edit:
Oh, another super usefull tool would be a dat manager (creator).
Add new field in the GUI, set a name, value, etc. and it add that tag to all games in the xml instead of using notepad to edit.
Maybe just use the same GUI with an option "editor mode ON/OFF".
I have lot of ideas (visual and internal features) but I lack software programing skills for computer to make it myself.
I know only Xul and Gecko (firefox GUI language).