I use it mostly to get the gliders in the air.
You can download all the keyboard commands here and print them out.
http://flyawaysimulation.com/downloads/files/7939/fs2004-keyboard-commands-table/
SLEW COMMANDS
Slewing allows you to rapidly reposition your aircraft without flying in real time. Use these commands to slew.
Slew Mode On/Off Y
Set Heading North/Attitude Straight-and-Level SPACEBAR
Freeze All Movement Num Pad 5
Move Forward Num Pad 8
Move Backward Num Pad 2
Move Left Num Pad 4
Move Right Num Pad 6
Move Up Slowly Q or F3
Move Up Quickly F4
Move Down Slowly A
Move Down Quickly F1
Freeze Vertical Movement F2
Rotate Left Num Pad 1
Rotate Right Num Pad 3
Move Nose Up 9
Move Nose Up Quickly F5
Move Nose Down F7 or 0
Move Nose Down Quickly F8
Freeze Pitch F6
Bank Left Num Pad 7
Bank Right Num Pad 9
Move Eyepoint Up SHIFT+ENTER
Move Eyepoint Down SHIFT+BACKSPACE
Move Eyepoint Left CTRL+SHIFT+BACKSPACE
Move Eyepoint Right CTRL+SHIFT+ENTER
Move Eyepoint Forward CTRL+BACKSPACE
Move Eyepoint Back CTRL+ENTER
MULTIPLAYER COMMANDS
Track Mode On/Off CTRL+SHIFT+D
Cycle Through Other Players CTRL+SHIFT+T
Follow Other Player CTRL+SHIFT+F
Switch To Observer Mode CTRL+SHIFT+O
Chat Window Display/Hide CTRL+SHIFT+] (R BRACKET)
Switch Focus to Chat Window ENTER