I'm a bit more hard-core than most (and maybe more than is prudent). I control the blower, the main circulator and the bypass circulator on my EKO with mine. Huff's approach is more reasonable - let the boiler do its own thing, but manage the heat loads and storage to optimize the boiler's operation.
Here's a chart from last season where I'm controlling the EKO fan (fan scale is % of full speed) to try and hold 1100 degrees combustion temp (combustion temp is divided by 10 to fit on the scale). You can see the purge cycles - have to do that every so often to avoid puffing when running at reduced fan speed.
While this is possible, I'd regard it as experimental. Varying circulator speed to maintain outlet temp is a lot more straightforward.