I made a thread about this already Much need features for W200 Thermostat and I know you dont want to just copy Ecobee, but just copy Ecobee’s list of fine settings. It works and is tried and true.
A compressor minimum on time (not just off), heat threshold, cool threshold, overcool/overheat. All of those settings put in would put this on par with Ecobee and Nest in terms of fine grain control many people do want (and may need for their system as HVAC isnt one size fits all).