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Automatic Thermostats and Steam Boilers?
The honeywell adjustment screws will select one of maybe three cycle rates. If you've set it for steam, you've selected longer cycles, or more accurately, less cycles per hour. Unfortunately, thermostat designers have determined that more complaints are made against large temperature swings than about short cycles. As a result, programmable thermostats might not let your system run long enough at each cycle.
YMMV(Your mileage may vary.) The size and configuration of your piping and size and condition of air vents and probably a few other factors determine how quickly your system heats. If your radiators heat up pretty fast, I'll bet the programmable will work just fine.