Will this be compatible with 0.7a saves?
Should be, and as far as I can tell right now it is (i.e. .7a saves load just fine). It's possible I'm missing something obscure, though, so I can't say 100%. 99%, perhaps?
Doh, since I decided to play Ironman for my first .7 game I went with Easy to get the hang of all the new changes but now those easy changes are waaaay too easy for me, lol. Are the Easy mode changes retroactive to current save games or no? If they are is there a way to change it to Normal mode via some command?
You can configure every easy mode effect through settings.json:
"easyPlayerDamageDealtMult":1.5,
"easyPlayerDamageTakenMult":0.5,
"easySensorBonus":500,
"easySalvageMult":1.5,
"easyOfficerLevelMult":0.5,
It's also possible to change to normal through code, and iirc the console mod lets you run code, so it should be doable. Also probably a pretty easy save-file-edit.