mrkgnao: ...MaGog's UI isn't particularly user-friendly...
...I would gladly improve it, if someone would give me pointers...
I tried to keep my suggestion small and simple earlier, but I could think about this some more. Does it appeal to you to do a radical overhaul? or prefer to keep it simple and just look for some tweaks?
mrkgnao: Adding 1,000+ US flags...
I could be wrong, it did happen once before :p A lot depends on how this regional pricing shift continues to unfold, it does feel weird already and the USA price being the headline price is confusing in a small way, any time I see US$ now I have to stop and think about it instead of just instinctively knowing it's correct. Sad and frustrating, all blame on GOG and the publishers of course.
mrkgnao: ..title search into the browser's search box...
The search box is useful and I do use it, although it also drives me nuts in the recent editions of Firefox - ever since Mozilla turned it into the 'one-click' feature. The way the one-click behaves means I now use other search engines more often, but editing search phrases, using copy/paste and right click has become counter intuitive and clumsy.
I've been meaning to look into other add-ons now the search box is different e.g. I no longer change the default engine and search by highlighting text on a web page. That was something used to do fairly often, but there probably are extensions to add to the context menu for the alternative search engines.
Not that this has anything to do with integrating the MaGog search by title option, I've added it to my browser :)