how to setup lights opposite of show

If power requirements are too much for your controllers to handle, that's not something the scheduler can address.  It's up to you to make sure you don't go over your power limits. 

If you want lights to remain on after the show has ended, you have to do that trick where you go to the end of your last sequence, zoom out so you can see past it, and then using the y tool change the 0% to 100% for each channel.  When the scheduler ends for the night, the lights will remain on until either the next song or the next show.  A much easier way is to just create a blank audio file for whatever time you need in Audacity, then just have the lights on in the sequence.