Put the car into the 2 position, then back to drive it should then start in first gear.
My car came factory with first gear starts, so I don't have that kind of issue.
I would think you could get a modified valve body on the trans from a place like renntech or brabus or somewhere, but it might be costly.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.