that is not 100% correct. they could use the OS fingerprinting technology to figure out how many different devices actually using the same connection. with that way it is not only possible to identify an OS (and count how many machines are behind a NAT), but in some cases it is also possible to identify single machines every time again! and if you use more then one device, they could disconnect you.

anyway that wasn't what i wanted to post.
looks like 0.3.1 solve my problem and it works now.
but now i run into another problem... or let's say i have an idea for an enhancement.
after stopping the hotspot, the phone should look for existing WLANs.
from what i could see here it stays connected, even if i'm in reach of a WiFi network that is known by my N900.