Each server should show via some sort of click box or folder tree which mods are required to be installed for each server. For example you may see a Clio server at LRP, when you go to join that server you have to download 15 other tracks, all of which are not downloadable so you have to wait for the entire process to keep retrying and then finish. If you could see which mods are required first before joining a server that would help choosing a server to join.