Please do try this yourself. Import three image sequences all with diff resolutions all with diff start frame numbers. 401, 801, 1487235. All diff resolutions.
Try these two ways to make a comp, at some point you have to enter in either your Start Frame (command K) or as you suggested, you can save the start frame by default but than you have to change the resolution as it no longer matches the sequence’s resolution.
I am proposing the ability for After Effects, in the year 2016, to have the ability to create a new comp that passes along those attributes of the image sequence into the comp. So by dragging the image sequence down to “make new comp” you get your 100 frame Comp, at proper reslution using the proper starting frame of 401.
Think of your typical Color grading systems, compositing packages, match moving programs, mocha, and all 3D packages. No of them default to a start frame of zero requiring you to reset this. The apps will gleefully set your first frame based on your image seq.
Imagine needing to go into 50 AE comps to change out the start frame one at a time because it starts on a zero frame by mistake?
Has anyone had to tell a client to go to frame one, which is actually the second frame because my software counts zero as one?
Thanks for reading!