Robert:
You can manage both RF channel and power settings for individual LWAPs manually.
Typically, Cisco does not encourage this but it can be done.
Also, you can have some LWAPs be automatic and others be manual.
Drill down into an AP entry and click on the WLC and click on the config link.
You will see dropdowns that permit you to force the RF power and/or channel settings manually.
Note: Instead of the mWatt or dBi settings that you may be used to seeing in the autonomous version of the APs, the power settings will have a value of "1" for full power, "2" for half power, "3" for 1/4 power, etc.
I hope this is helpful.
- John