It's not sure that connecting to more hosts will give you more search results.
Anyway limewire's internal (non configurable) settings are choosen to give optimal performance .
If you want full controll over your network settings you could try Phex.
Note: you don't need any lists, just increase your connections settings and Phex will connect to more hosts.
I never let Phex connect to more than 6 ultrapeers, I don't seem to get better results connecting to more than 6, it just increases network traffic.

__________________
Het algemeen gnutella forum in Nederlands