How to deal with 2 drives?
/usr/local0
/usr/local1
??
/usr/local/drive0
/usr/local/drive1
How to deal with 2 drives?
/usr/local0
/usr/local1
??
/usr/local/drive0
/usr/local/drive1
Nope...
The ideal situation as I see it is /usr/local containing symlinks to /drive0/emptriv, /drive1/gpsapp, or whatever. So the install program would install them to a user-chosen path, then create a link in /usr/local.
That way, those who choose to install on the music partitions and those (like me) who install to the spare 32mb partition can both have our programs available under /usr/local. The physical location is abstracted.