I tested at some point what effect fan have to cpu temperature. If I remember right it dropped temperature about 5-10°C. Fan was small and did no spin very fast. Case was open and cpu ran at default freq. So I think it is good idea to use some kind of fan. Higher (near 100Mhz) frequencies it might be more important, if not mandatory.
But how to connect it, I can not really say. I have flat round heatsink at my CT60e:s 060, so I have no experience with those. If there is anyway to use any kind of screws, I would use those.