The PC Keyboard Map mod by DMichaels provides a useful graphic keyboard map for the vanilla keys used in Fallout 3. These are the same keys used in most other Bethesda games, so the map is also quite useful in Fallout New Vegas and some of the recent The Elder Scrolls (TES) games like Skyrim. Unfortunately the map is in a .pdf file, and neither online PDF editors nor free PDF editors are able to edit it. Adobe Acrobat (the full program, not the Reader) or some equivalent professional PDF editor is needed if you want to add additional game-specific key annotations to the map.
One suggestion is to printout the basic keyboard map and then add annotations with a pen or pencil for the hotkeys added by mods. This can be quite useful during the game since it's hard to remember all of the hotkeys and how they work. For those needing more details on use of the pencil device (vs. a keyboard) see Pencil.
For the mods in the Fallout 3 guide the following additional hotkeys are used.
Fallout 3 Wanderers Edition
Grenade Throw Hotkey (default is 'G')
Grenade Toggle Hotkey (default 'H')
Hold Breath while shooting to improve accuracy Hotkey (default is 'C', recommend change to 'K')
Primary Needs menu Hotkey (default is 'Numpad Enter']
Scan weapon hotkey (default is 'S'); used only while in Pipboy inventory menu
Bullet Time Hotkey (set this to 'C' in Bullet Time submenu for compatibility with FNV default)
Sprint Hotkey (set this in Sprint submenu)
JIP Selective-Fire
Hotkey (default is 'B') switches between fire-modes
Held for one second when the weapon is holstered: Opens the Weapon Setup Menu, where various settings can be configured for every weapon, individually
Pressed while holding 'SHIFT': Opens the mod's Control-Panel
JIP Realistic Weapon Overheating
Hotkey ('Shift' + 'Backspace') opens the mod's control panel
Flashlight
Hotkey to toggles flashlight on and off: (default is B, recommend changing this to 'L' to avoid conflict with "JIP Selective Fire")
Immersive HUD - iHUD
Hotkey (default is 'I') toggles HUD display on and off
Hold hotkey for 2 seconds to bring up iHUD settings menu
Adjustable HUD - aHUD
Hotkey (default is 'F6'); press hotkey until settings menu appears
Advanced Recon Thermal Nightvision
Hotkey ('N' key) activates nightvision to increase the brightness in incremental steps
Thermal Imaging Hotkey ('M' key) activates thermal imaging and cycles though thermal imaging options
Powered Power Armor
Power Armor Menu Hotkey (default is 'P') also brings up settings menu
TRO Hotkey (default is 'Q') changes Thermal Regulation Override state
Stimpak Counter
Hotkey ('Right-Shift') allows moving position of counter on screen using arrow/cursor keys
CASM
Save Hotkey ('F4')
Restore Hotkey ('F8')
