In order to circumvent a player blocking an entrance, player collision could be deactivated while performing a roll dodge or any other evasion mechanic. This way other players would not be able to block an entrance or passage simply by standing in the way forcing you to flag on them.
My second sugestion would be to deactivate collision for people in the same party, this would prevent a lady's first kinda situation every time you and your group have to go trough a narrow passage together.
If non of the above you could alway just give us a /push command that would allow us to push another player aside without flagging. (with a cooldown)
edit:
https://ashesofcreation.wiki/CollisionInertia and momentum physics will help prevent blocking doorways/access points. This is based on a character's direction and movement speed, and can be used to push people out of the way.[2][1]
how will this work with a caravan, will i just run people over?
I would love to hear your opinions on this matter, how would you solve these issues?