Don't like it, don't take it. That bonus is significant for Martials...They can't fly or create fireballs, but if they can get a +1, it might be worth having...
I think the point is that if you're building a race from scratch, you're throwing RP points away spending 4 on that when spending 4 on another ability gets you the +1 CMD AND a bunch of other stuff. A +2 dex or str is worth a heck of a lot more than a +1 CMD but they cost the same RP.
Or a +2 dodge bonus to AC which also applies to CMD. I doubt it's a typo, but there are a lot of skeevy things about the race builder. For example Spell resistance, lesser (6+HD) is 2 RP and Spell resistance, greater (11+HD) is 3 RP. Either is available regardless of your RP buy limit (assuming greater than 2), you'd assume greater would at least require advanced or monstrous point buys.