I did a bit hardcoding and trying to develop my own widescreen soloution which is a replacement of the HighRex Fix d3d9.dll. It's not perfect by now, needs more code, but 3D interrior is no longer stretched in 16:9 (without camera mod). Next steps are the correct positioning of 2D overlays and variable input configuration of screen resoloutions
see the command bar is not stretched, maybe I render it in the middle of the screen