This is becoming quite a F.A.Q so I thought it would be good to put a suggestion forward.
It would be SUPER handy if there was a bauxite command for toggling the FPS FM camera to a similiar one to Grid mode FPS...cursor on screen with drag to look movement (though that bit is not so vital), mainly so that HUD elements and widgets can be interacted with, and then toggled back to standard FM FPS.
Right now, the only solution (and for many its not really working) is to lock_camera() in a script at the same time as showing any widgets.
This CAN show the cursor, but only if you move the cursor off the edge of the screen and back (if windowed), or crazy wiggle it in full screen.
Then reset_camera() on widget close to reattach the camera to the mouse.
As more and more users seem to be asking how to show cursor/interact with widgets in FM FPS games, it would definately be good to have script command to allow for cursor/widget interactibility mode and back.