Feature Request - Add ability to mass select custom proton

[Brad7173]

Steam Rom Manager is great tool. Unfortunately, it doesn't have a method to select a custom proton when adding roms into steam. From my testing, I'm not sure that is a viable option in Debian 12. It can perfectly add shortcuts but it's missing compatibility. Imagine having to set 3,000 roms to use Proton Experimental.

That said, it is already apparent why ProtonUp needs this feature. The end user could mass select all the games/roms and choose one proton to use for them all. I'm not sure the best approach for this such as holding shift and selecting a mass of games / roms in the list then selecting one proton for all. This should only work if mass items are selected, otherwise ProtonUp would function normally.