Mods giving you an unfair advantage are disallowed. Redpower would require the server to install the mods, and we're not doing that. A mod like a minimap is allowed, as long as said minimap doesn't show ores or elaborate cave views that would make it unfairly easy for you to mine ores.
If there's a specific mod you're curious if would be allowed, just ask.
The rule is that we discourage the use of all mods, so if want 0% of being banned, don't use any.
"No hacks, cheats or mods, you will be banned without appeal."
You can be banned without appeal for the use of any mods. By using mods you accept this risk.
If anyone wonders why? Mods are created by a third party which neither Mojang or Us have control over. As such they can cause issues for the server (have done in the past). As such they are banned. Use them at your own risk.
Ok, thank you. I will be sure to have a separate .Jar file for my modded Minecraft for single-player use.