Yes, it starts with the key. No additional start button needed.

330 Nm AT was replaced with the 560 Nm version. Think there's no way to get a solution with a Mercedes MT, because of the torque. We had a racer project over here in germany a long time ago. They used a BMW M5 Getrag MT gearbox with an adapter. But that's a lot of work. Crossfire Nordtruppe - Galerie - Kategorie: Fire Racer

The Crossfire had a first run on streets. But there are still some little electronic problems to solve. The At runs with the AMG M-mode software, so you can switch gears manually, you don't have that delay, and the the engine runs into limiter - so the AT doesn't automatically switch into next gear when reaching the revs for switching. Motortausch V8 - Umbauten, Modifikationen ... - Chrysler-Crossfire-Forum - Das Crossfireforum für Crossfirefans

Regards
Markus