A quick solution to find a good pool from the pre-configured ones is, to first activate all of them and then look into the Profit Readings (Click on the mining group header in main window) and see which pool has the most working algos in the top positions, deactivate all other pools afterwards again.

But you can always just add other (yiimp-based) pools to your liking.

If you find any non-yiimp pool you would want to be able to use, just let us know and we will look into it in order to add needed interfaces