In rare instances I've seen it connect to more than 10 hosts. So any suggestion that the number of connections is capped should be disregarded. However, it appears that you are really interested in increasing the number of connection and I question your commitment to following-up on this issue. So let me give you a few pointers without doing the work for you.
#1 In the developers thread ask if there are any limits or caps
#2 goto
http://www.limewire.org and download the source code take a look at it and make any changes you like.