For a RM player to play dm will help his Massing of units, Unit control, and over all productivity of resources and time management. Not to mention it helps you learn hot keys.
Reveal. This has helped me fine tune strategies and booming. When i am trying out an idea i have the reveal on so i know if i have the resouces the strat will work.
The Med and high res skip the O so difficult first couple mins of the game. and helps you work on the middle parts.
When i was in darq and was taught to boom (thanks neil, solo, neo) like no other. What im saying is dont become a specialized player. Neil (not to pick on you) Only plays water maps at a certain speed certain settings. Now while he may be one of the best boomers in the game, people know what to expect when they play him. Try a tool rush at 9 flat or attacking all out in stone.
One last thing... Recently i have been letting people watch me play. Any of you are welcome to watch, take notes, what not. I warn you i havent played in a month but the strat is there.
wogger
ps sorry it got so long i am really bored at work