I think it's really just a matter of personal preference. For example, in my home office, I have a window that abutts a corner, much like the one that segbrown has pictured in his first photo he attached. And another window 24" away from that first window. Both windows are located behind a desk with a rolling chair. I created cornices for the windows, and b/c both windows already have wooden blinds on them I bought a pre-fab panel that I plan on cutting in half and using both of the halves on the outer sides of both windows. Functionally, having two panels on BOTH sides of EACH window would not work for me, as the drapes are likely to be caught in the wheels of the rolling chair. So, I just improvised- especially since the panels are going to be faux anyways. Again, its a matter of personal preference. What do YOU want? You're the one that's going to have to live there :)

Roller shades or Roman shades that raise and lower would be odd and impractical in front of doors. If you have them lowered even a tad the door is blocked. The logical solution is no shades but drapes for doors and windows and hung on the horizontal beam across all windows and doors in the room. Make the rods wide so they can open without blocking any glass.

Hard to understand why a northeastern exposure would get a lot of sun. Perhaps a small amount in the early morning in midsummer, but it has to be out of the sun after that. If it's more eastern, than northern, a little more morning sun. My solution would be to plant small shade trees not to far from those windows.

A top down/bottom up shade would allow you to let light in at the top but have the bottom covered for privacy.