DislikedAnd RR is also considered a technique to manage better trading outcomeIgnored
RR is what the system yields in average not what you want it to produce. --You cannot ask the market 90 pips just because you want 3:1 and your SL is 30--
Let's take Thomas Demark's breakout strategy as an example. He noticed that, after a BO, the price usually moves to a level defined by a projection. You cannot increase the TP in order to increase the RR. This would destroy the statistical edge of his system.
The same way you cannot adjust the win/loss ratio, you cannot adjust the RR of your strategy "to manage better trading outcome". These two values are what they are for a given strategy (they are intrinsic elements of the strategy). That's the strategy itself you have to adjust to increase the expectancy.
Regarding MM, I've been pointed to this http://articles.mql4.com/631
No greed. No fear. Just maths.