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It is possible to read most info about a photo and to programmatically set presets. So, I think the answer to part 1 of your question is: "Yes - quite doable".
Personally, I'm not sure how quickly I would get to this, since I'm in the middle of other plugins at the moment.
A lot of this you can already accomplish by creating smart collections, and selecting the collection that would choose the ones you want, along with the folder you want to target, then apply the desired preset(s).
I realize this does not achieve the level of automation you desire, but it might get you by until your desired plugin comes to light(room).
In fact, even if the plugin were to automate it, I could still imagine the built-in collection mechanism providing the logic for photo selection, making the implementation much simpler, i.e. just apply specified presets to specified collections and thats it - you make the collections.
Hmmm... what do'ya think?
1. Great News this is possible in the SDK
2. Good idea about the smart collections - I'll create a bunch for this, called something similar to the associated preset - Eg. click on Collection 'A', select all images, click on preset ' A', then repeat for 'B', 'C', 'D', etc. So as you say, not automated, but not too bad either.
3. Looking forward to you (or others) having time one-day to make a great plugin!