The first year of the B8 S4 didn't have launch control.
The 2011 model introduced it the same way we engage ours. No buttons, no car dynamics programming, just brake, accelerator, build up revs and go.
In fact this is how MOST cars do it. Those requiring buttons also engage other engine and transmission and maybe even suspension settings for a "sport" mode.
2012 Ford Focus Titanium Blue Candy Hatch 2009 Suzuki Swift+ - Traded in 2006 Lincoln Zephyr - Traded in
If you live in Edmonton, AB I would be more then happy to do a shoot with you!