Rotating Walls Without Scroll

Im using a laptop. I’m enjoying my experience so far but whats stopping me from progressing is the walls. inorder to rotate walls you have to use your scroll i understand that but i dont have mouse so i cant scroll so is there anyway to do this without having to use scroll.

Google “scroll wheel emulator”, you’ll find what you need.

currently there’s no input options for that

[editline]15th December 2013[/editline]

that will definitely do the trick though!