Script call to restrict player based on player location?

So, I searched the forums a bit and can't seem to find the right answer (although I'm positive it's buried somewhere in here... sigh)

Anyway, I would like to use a plugin that breaks Yanfly's region restrict. I'm hoping to do something to resolve the issue it creates for a game that already has hundreds... if not thousands of doodads.

I would like to use a player location parallel event (I need no help with that, I got it working great) and (I'm assuming) a script call to restrict player movement when they touch a certain region, only within that region.

So if my player is walking around the map, I want to block access to all tiles with region 4 (for example) over them.

Alternately, I would also like to allow passibility based on a specific region in the same fashion (obviously a different script call though, haha)

Is this possible?

P.S. Using just the vanilla move route I can make the player go back a step when touching the region, but it just looks and feels weird.

I don’t know if it’s possible vanilla but Yanfly made a plugins specifically for this kind of thing! Region common events!

http://yanfly.moe/2015/10/19/yep-17-region-events/

Thank you very much for that. I may have to try that if no script call exists. Also I wonder, if this plugin breaks region restrictions, would it also break common events? I don't know.

I am hoping that if there is a script call that works for this though, that someone sees this thread and tells me. I like to avoid using plugins wherever possible.

there is no such script call - can't be due to the way computers process data.
the only thing you could do is the same as used with the other plugins: redirecting the move check to a plugin and modifying it. but that requires a programming override by plugin, it can't be done with a simple script call.

because basically, when a move command is given the computer checks if the next tile in that direction is passable or not. That is a series of data checks based on map and current position, and you could redirect that to add your own additional checks. but a script call can't change this series...

Ok, thank you so much for that clear and comprehensive answer, I really appreciate it. :)