It probably won't help your speed any but you could see better search results. You don't have much bandwidth to play with so I don't think it would be worth it.
Here's a link to a post on how to set-up you LW to work best with a dial-up connection
http://www.gnutellaforums.com/showth...threadid=48573
BTW if you would decide to buy Pro make sure you get it from the official site
www.limewire.com and not some scam site
.