Keyboard shortcut to create a room in up/down directions about trizbort HOT 3 OPEN

Or perhaps Shift-"+" and Shift-"-" (actually _ ) -- so the view navigation and room navigation are the same key set, but with shift.

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Sure, but where would the room go? To the top left of the current room? Top right? There isn't an obvious direction.

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where would the room go? To the top left of the current room? Top right?

The convention in IF maps historically has been "where-ever it fits." Assuming that a user has added their compass rooms already before adding an up room, one behavior might be:

if user creates up-room:
  if no room in north, place up-room north;
  else if no room in ne, place up-room ne;
  else if no room in nw, place up-room nw;
  else place up-room north with offset; // overlaps north room with offset, user can then drag

from trizbort.