Cheers for the update.
Is it possible to add the ability to read title info from game.iso files? - It would be a matter of opening the game.iso (360 formatted?) and grabbing the information from the default.xex contained within.
What do you mean by "title info"? It already reads the game name, TitleID and MediaID from 360 ISO files. What more would you need?
1) DLC/XBLA comparison list.
2) The app to read the FSD xml files
Jackkill is right about #2, check out gadabama.
As for the others:
#1 I'm not aware of any master game/DLC list like there are for other ROM scenes. abgx has a list of releases, but it doesn't contain enough information to match to individual content files. If you know of a regularly updated database of 360 content that contains more than just scene release names, let me know.
#3 This is possible, but it would be a lot of work to make it function reliably over FTP. There's already a helper function that can scan your 360 and show you if files on your PC are already on your 360 or not, but it requires enabling the beta/advanced features in the options. Then you'll have to figure out how to use FSD to map a network drive, which can be confusing/buggy, that's why the feature is currently hidden.