How do I triangulate a quad along the alternate diagonal direction? Quite often I come across a mesh where I have a quad I want to triangulate, however upon pressing CtrlT, it triangulates in the opposite direction I want it to. I'm only dealing with a single quad within the entire mesh, so I don't want to use the triangulate modifier here.

Is there an way to have more control when triangulating a single quad within a mesh?
You can choose Fixed or Fixed alternate in the redo panel after triangulating:



If you prefer an all keyboard shortcut method, you can press CtrlE, R after triangulating to rotate the edge.



However if you are only triangulating a single quad, you can also select the verts you want to create the edge between and press J: