I'm having issues (& don't remember seeing a solution) of having the map entry points reset to player 1 in SHARED territory (or whomever owns it)... no matter the "default" or "current" options set. If I add a map entry point, change it to a diff player owner than the ter belongs to it resets, forcing me to create sep ter for each player... quite the pain!
A mapentry point always belongs to the sector owner. When you set up a team territory and assign it to player 1, all mapentry points in this team territory will belong to player 1, you can't change it, because the WB will always overwrite it again, but that doesn't matter since the whole team shares these mapentry points. The only exception you use the mapentry_point_
player object. I hope this is the answer you are looking for.