Push these button combinations while in battle:
Shift-U look down
Ctrl-Alt-5 auto level (trim)
P-Tab look around
P-Tab-D debug mode gives you readout for coordinates on second line (NS and EW); altitude (divide by w; and speed. The third line is your frame rate.
P-Tab-T teleports you to those coordinates.
+/- increases and decreases speed
PgUp/PgDn increases and decreases altitude
F3/F4 rotate right – rotate left
Shift – F3/F4 rotate up and down
Ctrl – F3/F4 rotate right and left slowly
Shift-Ctrl F3/F4 rotate up and down slowly
~ - key restarts sim