Hm, here are some answers:
1. Not in the default IDE. But what I like to do is have multiple windows open and just ALT-TAB between them.
2.
object size x(Object Number
) (or y, or z)
3.
object position x(Object Number
) (or y, or z)
Note: Remember, that the Y axis is up... I assume you meant X and Z coordinates.
Feel free to ask with any...more... questions..?
Edit: I realized you said "real time" readout. Just put something like this in your main loop.
set cursor 0,0
print "Object X Coordinate: ";object position x(1)
print "Object Y Coordinate: ";object position y(1)
print "Object Z Coordinate: ";object position z(1)