Hi.
I have a suggestion for structuring the installers for games that use DOSbox/ScummVM: Please make it so that the game files are not in the game's root - i.e. not D:\progra~1\dragonsphere, but D:\progra~1\dragonsphere\drive_c
If a game NEEDS multiple drives (Xcom game with the town), then in the game's root, put drive_d(cue+bin).
The game's root would be less cluttered, plus it'd be easier to move your purchased game to a different VM/interpreter.
OR, provide alternate .zip of the game. If it's a quest (graphical adventure), make sure the ZIP has the executables so it can be used with DOSbox rather than SVM.

Best wishes to GOG team!

The DOSbox games don't mess with the registry, so you can freely install in whatever folder and then just zip the files for future use.