I'd like to get back into smoking after a long hiatus. I had built and used a HeaterMeter 4.0 many years ago which worked fine, and I just powered it up and upgraded the software and it looks like everything is running OK. I see that HeaterMeter is up to version 4.2 for the original raspberry pi. What are the major differences that I would be missing out on by running the 4.0? Also I see that most people are now using damper/fan combinations instead of just a fan like when I built the unit -- is there a way that the 4.0 can support a damper? Thanks.