I saw a post on slashdot telling how to make K-Meleon working with proxys:
Edit the default\prefs\all.js file with notepad
Look for the following lines :
pref("network.proxy.http", "");
pref("network.proxy.http_port", 0);
and modify them so it looks like this :
pref("network.proxy.http", "my_proxy_ip_addr");
pref("network.proxy.http_port", my_proxy_port);
without forgetting to modifying the my_proxy_ip_addr and my_proxy_port values
If you are using a socks proxy, you should modify the lines :
pref("network.hosts.socks_server", "");
pref("network.hosts.socks_serverport", 1080);
I didn't try it myself, so i don't know how reliable these informations are... Post replies here if it do or do not work...