Well, my lab looks like a tornado hit it.
I have been loathe to do it, but I pulled both my main desk and my test bench off the wall, and all the electrical guts and wires are now strewn across the desktops...

It is such a mess, and I knew it would be. But, it'll be good when it's done. Extra lamps are getting wired in, and big sound is getting added to the desk, as well as a nice webcam and mike capability. Extra 110 plugs, a bigger switch... all the stuff that I haven't done because I really, really didn't want to move that desk.
The vital purpose that finally tipped the balance was the docking station for my new(er) laptop, but at the same time, removing KVM from my system. A buddy shipped me a more than adequate RDPWrapper, and I am confident enough that the boxen on my desk, and on my test bench are now all headless, except for one each, respectively.
I may leave a KVM on the test bench to toggle guest machines to the monitor, and the pre-stage bench, where all the scanning happens, will remain KVM, but my main boxes are now headless.
Which brings me to my question, or maybe observation... There are some niggling issues to consider wrt going rdp headless:
1.) I haven't found out how to shut a machine down via RDP, other than by cmdline. I am currently writing a little gizmo to provide shutdown/restart, and maybe logoff/switch_user (without dropping the rdp connection if possible), which I will pin in the start menu on each machine... But for now, I have to use VNC for that function. I would like to eliminate VNC, but I am finding it to be necessarily retained.
2.) I should have predicted it, but I cannot find a way to log in by rdp, where the user is not present in both machines. My media system 'user' is not in my business boxes, but my laptop is often used to access the desktop on the tv in order to read things I can't read naturally from my chair (be it the chair at the desk or the easy chair). Again, VNC to the rescue, or I have to put the media machine user into my business machines.
Sound and vid are far superior to vnc, but printer support in rdp seems to be hinky. I can get around this by printing to the network share, but it sure would be nice for it to work like it ought (printing to default on the host machine).
RDP tends to not be able to WOL a machine that has gone to sleep - Right now I have power setting to always on, but again, VNC worked fine before.
Is there anything else I should watch for or be aware of? I have used RDP for a while, and understand it's general function - These are all issues that have reared themselves because I am committed to making the lion's share of the boxes headless. I am doing this. It is 2kewl not to. But it might save me a bit of coding to find better methods.
TIA