Agreed, I like the agent managed vs agentless, it just seems more granular. Or it could just be my resistance to change for the sake of change.
The agents will run on 2012 (and 2012R2) it's just still difficult to find the SPP (Last time I found it, it was located here:
ftp://ftp.hp.com/pub/softlib2/software1/supportpack-generic/p1235385378/v89111/MSw2k12r2-rtmsupplement-2013.09.0.B.win.exe ) That's the SPP for 2012 R2.