To set the engine resolution, I use Regedit to change the width.
Open regedit, go to: HKEY_CURRENT_USER\Software\Tencent\MobileGamePC
Change the value of VMResWidth to a00 and VMResHeight to 438.
When you start the engine it will have resolution 2560x1080.
You also need to adjust the Key Mapper on the engine and Controllers on the game.
For items like Energy Drink and Grenade, you'll need to move the controller on the game to follow the default mapper position. Basically you'll need to try moving the mapper to follow the controller position, and if it not working then the controller should be following the default mapper position.
This way is pain in the ass, thats why I requested a ultra wide screen support :D