It's a mod that works in a very similar way than some other mods (listed below), however it comes with some balanced effects that seemed to be requested by some players. So here it is:

Long story short, it allows to save whenever and where you want with some limitations and malus:
- You can't save in combat
- You lose 1 adrenaline perk rank each time you save

It comes in 2 flavors:

1)Highly recommended:  The direct console script command: with FO4 Hotkeys, no esp, no item needed, it works straightforward.

-First, it needs the console hotkey enabled, The easiest way is to install the lite version of FO4Hotkeys (by registrator2000):
 http://www.nexusmods.com/fallout4/mods/11664/? .
-Next ,install the script mcQSSaveHotKey.pex in your fallout\data\scripts\ folder (or do this with NMM)
-then open the Hotkeys.ini that has been installed in your fallout\data folder then add the line in the [Hotkeys] section:

F4=cgf "mcQSSaveHotKey.mcAutosave"

Since 1.2 you can now call different settings (only in the FO4Hotkeyversion)
Choose your setting by adding the type of save you want (only one for the same key) in the Hotkeys.ini file:

• Default regular version: no save in combat, -1 adrenaline rank:  F4=cgf "mcQSSaveHotKey.mcAutosave"
• Default regular version: no save in combat, -2 adrenaline ranks:  F4=cgf "mcQSSaveHotKey.mcAutosave2Ranks"
• Default regular version: no save in combat, -all adrenaline ranks:  F4=cgf "mcQSSaveHotKey.mcAutosaveAllRanks"
• Default regular version: no save in combat, no adrenaline penality:  F4=cgf "mcQSSaveHotKey.mcAutosaveNoCombatOnly"
  

I put F4 here for the example, but you can set the key you want, even a combo like ctrl-F4 (as long as it doesn't interfere with other ones.)
And you are set. You have a hotkey with a quicksave outside combat and with adrenaline balance.


Thx to TheAdipose for the video:



2) Esp version: uses a favorite slot and item. (version not supported anymore, the fo4hotkey is the best way to go)

Install with NMM or copy both esp and bA2 in your fallout\data\ folder. Activate the esp in NMM or ingame mod manager.

The mod add a .quicksave item in you inventory (Aids folder), that you can put on favorite, and you can use it whenever you want during your gameplay, except when you are in combat*. Also, each time you save your game you loose 1 rank of your adrenaline perk.

Note 1: The "save item" is given to you automatically, however:
 -If you start a new game from scratch, the item can be found in the sanctuary workshop
 -If for some reason you lost or dropped your quicksave item, you can craft one back at the chemical_workbench/misc (needs 1 steel) 
Note 2: *in combat mean when *you* are not engaged yourself in combat. Your followers or your surrounding can be in combat.
Note 3: the code is somewhat different than the other mods one, but shares some logics.




--------------------------------------------------------------------------------------------------------
Mods inspiration:
-Survival Quicksave (by Gopher): http://www.nexusmods.com/fallout4/mods/12593/?
-SOS - Sleep Or Save (the chem part)  (by Loganbacca): http://www.nexusmods.com/fallout4/mods/12262/? 

There are other mods too that can fulfill your wishes.
- If you want to save anytime, anywhere, aside with the gopher's one, you can just use the Fo4Hotkey (by registrator2000)  http://www.nexusmods.com/fallout4/mods/11664/? and set a command like this: F1=cgf "Game.RequestAutoSave";
- If you want to have a chance to loot an holotape that allows saving (by DeEz): http://www.nexusmods.com/fallout4/mods/12504/?
- Or this one, which add a simple Savepoint in settlement (by myself) http://www.nexusmods.com/fallout4/mods/12654/?