To follow-up on this, I eventually saw that if I set up a hotkey to disable the Screen Edge Transition and "allow synthesized input", I could write an AutoHotkey script (set up as a desktop icon) for the secondary user of the laptop to run if they ever got annoyed by the transitions. However, I haven't as yet figured out how to run this script automatically - when run by Task Scheduler (after login + delay), it fails for some reason (i.e., I don't know where the malfunction occurs).
At any rate, I'd like to formally request that there be added some kind of per-user differentiation in the Input Director settings, at least to set whether which user has their screen-edge transitions enabled or disabled. This would obviate the need to have to automate this outside the application.
Thanks for your consideration.