Rod,
thanks for pointing out that typo. fixed now.
the angle should be in centi-degrees. so degrees * 100. 4500 = 45 degrees.
By the way, we're working on "[url=https://github.com/rmackay9/rmackay9-ardupilot/tree/onion3/libraries/AC_AttitudeControl]the onion[/url]" at the moment. This is going to change quite a bit how you create new roll-pitch modes. In fact, you won't be able to create only a new roll-pitch mode but instead you'll have to make an entire new flight mode (or modify an existing flight mode). You can see the beginnings of how it will work if you look in the [url=https://github.com/rmackay9/rmackay9-ardupilot/blob/onion3/ArduCopter/control_stabilize.pde]control_stabilize.pde[/url].
I don't think that means you need to stop what you're doing though, I'm converting all the existing modes to the new structure so you should be able to retro fit what you've done in a similar way.