1) I wouldn't limit things. Or maybe do, but add an option to disable it. To me, I'm just moving all the ore nearby so I can toss a nice square patch of miners on it and forget about it. Making mining outposts isn't what interests me, and making this require pasting near the original patch location would just mean I'd have to toss a rail down between my base and the patch, rather than pasting it nearer my base. It doesn't add anything, IMO, to have to run 100 chunks of rail to the ore back to my base instead of just having it pasted at the base.
2) This would be nice.
2.5) Add Oil and other resources, like Mineral Water from K2? Paste them on a grid like the Oil Patch Organizer mod does.
3) If so, make it optional. My primary base is a hex-grid rail base. It's not chunk aligned, and it repeats hexagonally, not in a rectangle. Maybe add an option for pasting X x Y sized? Or maybe use the same +/- square thing that landfill uses.