Hello. I have seen top runners binding MScroll as well as LMB to Use bind and I want to ask how is that done bc it seems impossible to bind multiple keys on one control in ol2.

You are allowed to have MScroll and LMB to the use bind. You aren't allowed to have multiple binds for any other action. To do it, you have to edit the defaultinput.ini text file.

Open it in a text editor (notepad works) and under the section where it says "; - Keyboard and mouse" add this line: .Bindings=(Name="F1",Command="setbind LeftMouseButton OLA_Use | setbind MouseScrollDown OLA_Use")

You can change F1 to whatever key you like. Just press the key when you're loaded into the game, usually it stays working the entire time but you might have to press it a few times, idk why but it breaks sometimes.