What about using unionfs and just forget all this /opt ****??? Qwerty12 built modules for diablo's kernel: http://talk.maemo.org/showthread.php?t=19104

No need to optify anything, programs would be automatically installed in a root overlay in the mmc. So good, so nice.

The only thing we should take care is to deactivate it when something should really be installed in the real root partition.

Wouldn't this be a good solution?