If it's a stock daily driver,i'd throw factory parts back in ,stay on top of the oil changes and call it good.Especially if the trucks a 2012 with a fair number of clics on it,odds are a new factory cam and OEM lifters will out live the truck.MDS is not the downfall,it's poor maintence and idling that kills the cams.If it was MDS causing the issues, the manual transmission Challengers wouldn't be having any issues,and trust me,they eat cams just as fast as the MDS engines do.
Upping the idle rpm to 700/725 is one of the best things you can do to a Hemi,but that requires tuning it,good news is your 2012 is fairly cheap to tune,a Diablo tuner will allow you to up the idle rpm,open up the speed limiter,and should allow you to disable the MDS if you want it disabled