First of all, all credits goes to Aerrus as mod developer for 1.0 and Radionecrotic as one who updated it to 1.2. If you want you can load updated Aerrus mod from PB discord. 
What changes outside of Radionecrotic's 1.2 update, well it doesn't change how Wait ans Shield actions were changed only changing Dash action to only occupy movement timeline. That's all, i post it here so other players that won't check on Phantom Brigade discord would see it.  

Description:
Do you have heavy mech with heavy shield?  And do you want to bash enemy with it? Maybe you have light mech and want to have some stile points? Now you can, changing dash action let you shield dash into enemy and let it to crashing state, collision damage would be absorbed by shield, making shield dashing a valid strategy in game.  Also now you can shoot with weapons while dashing in the air, but be careful with overheating. 

What mod does: 
- Change the way Dash action show on timeline, it showing like 1 row action on movement other then torso + movement action as it is in vanilla
- Remove changed Wait option from Aerrus and Radionecrotic mod and returning wait action back to vanilla
- Remove changing in shield duration, returning shield duration back to vanilla
- Let you add shield, attack(primary/secondary) action over dash action, adding ability to shield dash and shoot while dashing 

Known problems: 
- Overheat meter on heat action + dash not showing maximum amount of heat, leading to mech overheat by attack + dash combo
- Dash try to set after shield action because of game logic, you can easily drag dash action on timeline after 1.1 update of PB
- Targeted shield will turn to enemy it was target to, leading to damaging other mech parts in the process, to prevent it set shield targeting on floor by Ctrl + Left click on ground facing enemy you want to dash into 

HOW TO INSTALL:
(Instructions stolen from ValorODST - Increased Active Mechs mod - https://www.nexusmods.com/phantombrigade/mods/23, who stole it from System Senpai in the BYG discord, sorry)
=====================
Step 1. Load the game for the first time, then exit.

Step 2. Locate the PhantomBrigade folder in C: <UserName>/AppData/Local (not your Steam folder)

Step 3. Unpack the Zip directly into this directory, it will come complete with a Mods Folder and a Settings Folder. (If asked to overwrite, only do so if you've never installed any mods before as this will overwrite your mod.yaml with a new one)

Step 3A. If you already have a Mods Folder just copy the Extra Modified Combat Actions Folder over to the existing Mods Folder

Step 4. Boot the game and locate the Mods Option in the Main Menu.

Step 5. Select the Mod and Add it to your Config.

Step 6. Select Save Config and Restart your game.