Despite playing since launch, I only found out about alternate access roads on maps roughly half a year ago after randomly calling in Panzerfusiliers on one of the 1vs1 community maps that was removed from the pool recently and then reading about it online though only to the extent of finding out that these routes do exist.
Is there a guide anywhere that lists all access points in all maps (preferably highlighted on map screenshots) and explains how you're meant to use them (I'm guessing by placing spawn flags near them, but I'm not clear on how near/far they have to be placed or any other such specifics)?
Or if there isn't, does anyone have the time to make one?
I'm not sure what you are asking? Are you talking about map entry points?