No sir. F4SE is the Fallout 4 Script Extender. That is, well a script extender. It goes into the main file and allows other mods using scripts to be built on top of it. Much like SKSE gave us the abilitiy to modify mods and such inside the menu, F4SE does much the same.
Mods like Place Everywhere and several others are reliant on F4SE, which is why I am usually unable to play after and update and version change. F4SE and therefore the mods based on F4SE are version centric.
The mod Whiskery51.3 is referring to is called "Increased Build Limit Enhanced 4K" and allows you to expand a settlement's budget on a settlement by settlement basis.
The mod that allows you to lock stuff up is... Hang on, Im looking...
Locksmith