If you could tell us the specific brand and model of the IP addressable equipment you’d like to use, that would help a lot as far as looking at existing solutions.
You’re quite right both that SmartThings doesn’t have a built-in concept of scenes, but that you can get the same end result in a number of different ways.
But sometimes exactly which ways do depend on the specific device involved.
Your general concept sounds very doable, it just comes down to the details.
And a quick note on terminology.
The language in which code for the SmartThings environment is written is “groovy.”
Customers can write both “smartapps” and “device type handlers,” or use ones written by other community members, if the stock versions don’t give them all the features they want.
