It appears that there is a SmartReflex patch and also a CPU Frequency Scaling patch available for the Palm Pre, but it's a case of using one or the other, not both.

Nokia have championed CPU Frequency Scaling for some time now in Maemo, perhaps they don't see the need for SmartReflex, or as with the Pre they're not compatible technologies? Although this could just be because the Pre SmartReflex patch locks the CPU at 600Mhz which obviously nullifies the benefits of frequency scaling - no idea why it does that.

It also appears that SmartReflex needs an accurate profile of the silicon in each device, which could be another reason why Nokia have shied away from enabling it by default. SmartReflex appears to be supported by OMAP2 as well as OMAP3, so could potentially be be of some benefit to N8x0 devices as well.