I'd love to have CCleaner on a thumb drive and be able to select which drive I want to clean. Unless I'm missing something, you have to have CCleaner on any drive you want to have cleaned. There could be a 'default' drive to clean but perhaps in options, of "Select Drive".
There is a portable version of CC which can be installed on and run from a flash drive. CC runs on the system drive only (I don't know how it knows which is the system drive, I've rather boringly only had systems on the c drive). CC doesn't have a drive option as the default folders to be cleaned are installed on the system drive: it's not possible to differentiate between system folders which have been moved to a non-system drive and innocent user folders with the same name.
I agree, being able to manually select the drive to be cleaned would be very usefull. For instance, running from a Bart PE disc or a UBCD4Win disc would cause CCleaner to "clean" the B: drive which is the RAM drive while booted from the CD-ROM. I would greatly appreciate this option in an ini or command line option.
????? um why not just use the Portable version????