Now that the plugin is working reliably its time for me to think of good use cases and things to automate with it - before I had mostly just used the plugin to monitor things...
Some of my favorite use cases, that I LOST when I "upgraded to less functionality" from Venstars with insteon modules to Ecobees:
Creating short bursts of heating and cooling for X minutes rather than putting the system in a narrower band of temps and potentially (read also: all the time) having them left in those settings when noone was home, or left running those settings when the little ones or babies or guests are sleeping.
Connecting those short "cool off for 10 minutes" or "warm up for 5 minutes" bursts of adjustment to hard buttons on walls like insteon key panels or to big easy to identify buttons on a web page on an iPod placed centrally for family/guests to use.
Compensating for Ecobee's inability to limit it's "fresh circulation" feature (the feature that lets the user request the circulation fan run for X minutes per hour to keep air from growing "stale") to certain hours or certain conditions. It's a lovely feature, but when it runs all night long and wakes up the babies or guests it's not so lovely. Indigo combined with insteon and the old venstars could prevent that quite easily...the super expensive Ecobees? not so much.
Improve on the home/away recognition ability with geofencing (for those that have figured out a robust geofencing solution for Indigo...). Sometimes I'm "home" but I'm "not in the house" for periods of time...and of course Ecobee doesn't quite understand that but one should be able to make it understand with Indigo and presence recognition.
A better home/away status handling (if and when that makes it back in to the plugin...I saw the note about it getting taken out. Perhaps there was something in there as a placeholder for future implementation?) than one can find with Homekit...since as far as I know Homekit still has no understanding of or ability to work with the "auto heat/cool" state. Maybe this isn't true anymore but when I last took a stab at homekit useage it includes no concept of auto heat/cool. Either you are in heat mode, cool mode, or off mode. Thats' fine for some parts of the world, but in urban Los Angeles where I live it's possible at various times of the year for the temperature to reach the 90s during the day and fall into the 60s at night, and being in one mode or the other mode isn't workable.
Those are a few of my faves.