How do you do that? have you an old pc with XP?
To do that, the modification of WindowsInnoSetup.iss.in is straightforward. Replace
line 51 by DefaultDirName={pf}{#MyAppName}
line 52 by DefaultGroupName={#MyAppName}
These modifications should be checked and commited by @Hombre
But, while for the usual user, this will make install surely easier, for the user who wants to install a few versions (release, debug, different branches, different bit depth) to test or experiment, multiple installations will become an hassle.
So I propose that for stable version (or when you ask for) I use the above modified windowsInnosetup and I keep as it is for development builds.
Do you agree?
André