In my case, Role play comes from the character I'm building...rather than building a character around a role play concept.
I typically build characters by choosing class, then paragon path, then class features, then race, then feats, then skill points to best suit my desired feat progression. Finally powers.
Example: I've wanted to play a Fighter. I figure I'd end up going STR and CON since that seems to be the most predominant type. However, after review or paragon paths I caught sight of Pit Fighter. The Pit Fighter add Wisdom to its attack rolls. Upon review of feats, it started to make sense that this should be a shield bearer. As such, I focused my race on STR/WIS/dex. I ended up going Half-Orc Flail wielder which supports my primary and tertiary stats.
I could have gone with a Shifter to optimize primary and secondary roles, but the half-orc race seemed to better suit what I was building for a sense of RP based on prior decisions made.
Wizards definitely designed the races to focus on certain classes. I consider it a design flaw of sorts. The positive being that this sort of design ensures a large variety in races being played in 4E as a whole. The negative being that I could never see myself taking Gnome, or Eladrin, Half-elf, Halfling etc for the above fighter build due to the current design.
Though I've never implemented it, I like the house rule of using one of the two Ability boost options per race as a mandatory, and allowing anything else as its secondary. Thus opening up a lot more options to the players to choose from without sacrificing their vision of 'optimization'.