Limit client PPTP connections.

I know this is on the wish list, but how far away is it?
I need a facility to limit the number of simultaneous PPTP connections for a number of clients.

Ie:
User Company1 - 10 max simultaneous connections.
User Company2 - 5 max simultaneous connections.

I really need this or one of our branches is going to use another vendors device to do this.

A facility to expire user accounts after X days would be nice too but the above is critical.