Josh, check out this thread:

http://www.peachparts.com/shopforum/showthread.php?threadid=48890&highlight=ignition+map

About 10 posts in they actually get around to explaining how it works.

To answer your question, yes, the timing is controlled by the engine control computer depending on rpm and engine load. There is a way apparently, to gain an additional 6 degrees of advance, in 2 degree increments, by changing out a resistor, but I'm not positive it applies to your car. See this thread:

http://www.peachparts.com/shopforum/showthread.php?threadid=32224&highlight=w124+ignition+timing


Hope this helps,

Gary