Is there a config file to disable any mods we dont want to use?
when you start the installer and click next, you have a choice of mods, just click the ones you want. Afterwards in the configuration file find the modloader config and turn off the mods you want by changing on to off
I got Redpower 2 to work. Just drag it into the mods file and every time you play the game make sure you go into .minecraft/redpower and delete the config file inside it. This will delete the block ids and it should run fine. The only problematic thing is that you have to keep deleting it every time you play because it is created every time you play, so you will get an ID conflict. Just delete it every time you play.