For those people who have trouble keeping non-CRB races in their world and keeping them making sense, I offer a bit of advice...
Map out your world (I use Fractal Mapper 8 myself), put in the major 'areas', countries, wastes, etc. Then type up a paragraph about each area. Then think about which races make sense living there, and put it at the end of the paragraph.
This goes a LONG way toward fitting in all the races your players might want. For example, let's say the game is taking place in Humandia, which is 95% human. The other 5% is made up of CRB 7.
However, one of the players wants to play a catfolk. You look over your world notes, and you see that Savannaville, which is on the south part of your continent has catfolk listed as 30% of the population. Now you can fit it in your head. He's a wanderer who's in the human lands, probably for some significant reason to get him this far north. He was a slave that was recently freed by the Humandia navy for example, and he's trying to find work to make enough money to get back home. Or he is seeking a lost relic that was stolen from his tribe, and his search has brought him to Humandia, as the thief was a human who used the coin of Humandia while fleeing.
It makes everything make a lot more sense when you know where in your world races would be from, and the environment, and why they might be somewhere else.