I was able to figure out the isometric WASD movement finally, but it involved quite a bit of seemingly simplistic code and the results werent exactly stellar. Pressing two keys at once makes my character do a jiggly dance in some random direction and releasing the keys leaves the sprite paused midstep. And the reaction is slow. But its functional.

I decided though, that if I really want to continue on, I need to make sure this is optimized. Ive sent out a help request at the GLBasic forums. Ill probably find out that my 40 lines of coding could be condensed into 1 simple function. :P