Requirements

OpenMW 49 (version from which i have created the mod)
OpenMW 48 (it may work but never tested)

How to install

Create a folder containing the downloaded files.
Launch OpenMW launcher and add Data Files by selecting the created folder
Check the box named clickToprepareWeapon.omwscript
Launch the game

How to use

Go to the Script tab in the options, select Click To Prepare Weapon and choose the click you want to use.

In game, you can now Prepare your weapon with a click.