WordPress MU

When someone signs up for a new blog, I want them to have to accept our Terms of Service, and particularly to have to read our "no personal attacks" policy. I've used Register Plus on a regular WP site successfully, but I can't see how to add some of its features to the default signup for MU. I saw a post here recommending using Register Plus along with the widget for Theme My Login, but this produced a mish-mash of all three login pages. A nightmare! I had to deactivate the 2 plugins and clear my browser cache before I could get back to normal. Oh, and to do any of that at all, I had to switch from the default MU theme to one with a sidebar, Atahualpa 3.4.4.

Any ideas?

We use this Terms and Conditions plugin, though we've modified it a bit.

Here's our updated version:
http://wpmudevorg.wordpress.com/project/terms-of-service-revisited

Deanna, thanks so much! That works great. And I was able to use the welcome message to insert advice about going right into Users/Your Profile to change the password, as well as an invitation to visit our how-to area for tips and tutorials.