I think at least since LW 4 or 4.2 there's been a set no. of peers for basic users of LW to three (3). For LW Pro users that's 5.
You can downgrade if you like & be automatically banned by some p2p apps. There's a pracitical reason why it's been done. For the health of the G network so more people can connect.
You can check the LW version history here:
http://www.limewire.com/english/cont..._history.shtml
Unfotunately the FAQ on the LW site is a little out of date for the newer versions due to frequent changes. I put in a request for it to be updated myself but there's a shortage of staff to deal with this immediately. There's a Java programming position available at LW if anybody is interested & has the necessary prerequisites