Some sort of "reset" control to adjust the temperature of the boiler based on outside temp. and/or demand would save some coal. I have done this on my own system...right now it is keeping my house very comfortable with 150F water. I installed a reset control on my dad's EFM also...he said his basement averages 3 degrees cooler due to the cooler boiler operating temperature. I have been using the Hydrostat controls, but there are other options.
Study on outdoor reset savings: http://www.heatinghelp.com/files/posts/ ... _reset.pdf
Honeywell reset controls: http://www.forwardthinking.honeywell.co ... 9_1974.pdf
These controls are probably the most complex I have seen, you can adjust boiler temp. based on outdoor or indoor thermostat feedback, set it to purge heat from the boiler after a heat call, etc. Another forum member had one of these on an AA260, he said it totally eliminated an overheating problem after long burns. There is something to be said for keeping it simple, but at least you know what else is out there.