No Combat boundaries allows NPC's to follow the player over to other cells
Sets all encounter zones to level 0 allowing the player to by chance see the random chance NPC encounters while adventuring.
All this dose is allow the player to play the game and experience more unique encounters without having to wait till they are a certain level just to see a super mutants spawn in with a few FEV hounds journeying around the wasteland.
Many other mods do the same as this but this mod is part of the BBMR pack so it will get constant updates if needed allowing it to be used with modpacks that require it.
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If you are after a mod that makes all NPC's the same level as the player then Leveled Characters All Player Level - All DLC is the mod for you.
BBMR mods was one single .esp but now split into a few allowing modders to pick and chose on what elements they would like to add to their game like the combat or just the ragdoll effects, it's a very customizable experience and tool that is script free and can also be used with consoles to have the same experience as PC players.