One address, many signatures. Does it make any sense?

[deisik]

I've stumbled across a thread where one dude has been suggesting to set up an investment pool for making cooperative investments and sharing profits (or losses, for that matter, lol). The idea itself doesn't look very promising to me (mildly speaking), but I'm more concerned with the technical side of it, i.e. how it could be implemented in the Blockchain (if ever) as well as what other possible uses it might have. Long story short, is it possible to make a multisignature address (wallet) where each signature allowed the withdrawal only of a certain percentage of the funds held in this wallet? Obviously, if some funds got withdrawn by a holder of the keys, his share would be accordingly diminished. Conversely, the coins transferred to this address (wallet) would increase the absolute amount due to each of the wallet owners...

The latter seems to be the most interesting aspect of this idea