If the stove is going to be a set it and leave it situation, then you can as Mike stated find the right combingation of feed and air. IF however you are going to set up a thermostat to control room temperature, then the stoker will be going from run to idle fairly often.. and this is where the 'full time' combustion blower works better..
So it sort of depends on what your ultimate goal is for the stove. Lots of automation and thermostatic control.. or find an amount of heat output that satisfies the needs of the room or the house.. and manually adjust it if needed..
Mike is correct in that there are situations where a full time combustion blower at 100% could be too much air, expecially if the needed heat from the stove is low. It depends on how good your chimney drafts, how you set your baro damper or DV, and how much heat you need from the stove.
Once you get a 'feel' for the relationship between coal feed, combustion fan output, stove heat output, you will be able to 'tweak' it to do what you want.. manually.
The best setup is a full time combustion fan, slowed down with a reostat when the stoker is off, then using a relay, whenever the stoker is pushing coal, the combustion fan is on 100%, bypassing the reostat. This way, the stoker's reostat can control feed rate, but anytime the stoker is feeding coal, even at a very slow rate, there is plenty of combustion air to make lots of heat and burn the coal well.. then when the stoker is stopped by the thermostat, the combustion fan is returned to the reostate controled rate,, providing some combustion air to the coal.. instead of the zero combustion air to the coal when the stoker is idle..[this is the way a triburner works, combustion fan on only when the stoker is pushing coal] . This is a fairly complicated setup, not one I'd try to explain in words.. for me it needs hands on.
If You are not going to use a thermostat to control the heat output, then my all means.. fire it up, try teaking the feed rate [stroke of the stoker] and stoker speed. You will soon find out if you like this setup. And find out if you are getting unburnt coal or not.
The flat bed stokers that I owned and ran had separate reostats for the combustion fans, and the stoves worked best when the fan was at 100%, but that is my situation, my coal and my heat needs.. your probably will be different.