Another consideration would be the major problem with bounce focus (aka yo-yo focusing). You have to bring in the pipe, add fixture, circuit and address fixture, approximate the focus, send it all back up, take notes, bring it back in and make changes.......yep, it can get very time consuming.
With dead hung battens you have to worry about the artists hanging their show using The Genie AWP without bothering with the outriggers. Scissor lifts, is the venue floor designed for the extra weight.
You could always go old school with scaffolding. The aluminum doublewide stairway scaffolding is very nice.
Here is another scaffold which is pretty interesting:
http://www.lightbulbscaffold.com/