I was hoping someone could help me figure out if there is a way to precompose layers into a specific work area you designate. For instance, you set an "in" and an "out" to your composition, then you precompose. Your composition then starts from the current time you're on and ends where you set the end of the work area. It would be like setting a length to the composition settings before you compose everything. I just want everything to be clean instead of having all this extra length at the ends of each of my compositions.
There is a script that will do that. I don't have the link with me.
I think that Rick might have been referring to this script:
But, there is a very important question: What version of After Effects are you using? In After Effects CC (12.1) last year, we added the option to trim the precomposition to be the duration of the selected layers that are being precomposed. So, this script is unnecessary.