It is not entirely clear to me what kind of input you are looking to use. If you want something like a 2-position switch to control what position the servo is in, as well as a light a simple indicator LED, you can do that with a Maestro, but it would require a custom script.
If you are new to the Maestro scripting language, I found the best way to learn (after reading through the “Maestro Script Language Basics” section of the Maestro user’s guide) was to load each of the Example Scripts onto my Maestro one at a time while using the “Step Script” button to run through them one command at a time. You can see the values on the stack on the right side of the “Script” tab and look at the current state of each servo channel in the “Status” tab to help understand what each command is doing. You can also use the “Command Reference” section to get a brief description of what each command does.
Alternatively, if the Maestro is connected to your PC through USB, you could control the Maestro channels directly from the sliders in the “Status” tab of the Maestro Control Center software.