I have multiple copies of the same game, all for different regions, and they all share the same thumbnails for the "Recent" and "Games" menus in PPSSPP.
For example, I own 3 copies of Ace Combat X -- ULUS10176 (US), UCES00423 (EU), and ULJS00086 (JP).
This makes it a bit tedious with finding out which version is which region, so I always have to right-click them to view the information page, so that I can see the game region and Game ID to identify which version I want to launch.
My suggestion?
An optional, small visual overlay for thumbnails that changes depending on the game's detected region.
It could function similarly to the "game config" gear icon, like so:

(This mockup is using free public domain 24x24 pixel region map icons)
This certainly isn't a major issue by any degree, but could definitely prove useful for other users in the same boat. Thoughts and opinions?