This may have already been covered but what, if any changes are made to the vB files? My concern is I don't want to have to modify files for the gallery each time I upgrade to an updated version of vB. Also are there any changes made to the vB database, anything that would force them to not provide support?
It alters the language, phrasegroup, and usergroup tables. I know someone there has said in the past (I believe it was Wayne Luke IIRC) that they would still support a forum that has modified the language and phrasegroup tables, and I don't see why they would have a problem with the usergroup table.
After 3.1 is released then I'm sure a new version of the gallery will need to be released since that is going to be a major release (which of course we will be working as quickly as possible to get a compatable version out). From 3.0.0 to 3.0.5 have all been compatable though.
As of right now, no. I may move the extensions listed in that function to a global list though, and only about 1/2 of the stuff on my to-do list has been moved down to the 'Done' column, so I can't make any promises that something on there won't require another change to be made.