In general:
Ctl: Main Window
Shift: Main Window
Alt: alternative windows

F1-F8		Help functions
F		Menu File
P		Menu Preferences
V		Menu View
H		Menu Help

Ctl S		Scanmode
Ctl C		Copymode
Ctl F		Faxmode
Ctl V           Viewermode
Ctl M           Multipagemode
Ctl E           Emailmode

Ctl ENTER	Start Scan
ESC		Cancel Scan

Ctl I		Info Dialog
Ctl Q		Quit

Ctl L		Resolution List
Ctl R		Rotoate Postscript
Ctl P		Save Device Settings (Put)
Ctl G		Load Device Settings (Get)
Ctl D		Change Directory

Ctl 1		Show preview
Ctl 2		Show Histogram
Ctl 3		(Show Gamma Dialog)
Ctl 4		Show Batch Scan Window
Ctl 5		Show Standard Options
Ctl 6		Show Advanced Options

Ctl B		Browse Filename

Shift Fi	Printer selection in copy mode

Ctl B		Bind RGB
Ctl N		negative
Ctl A		AutoEnhance
Ctl 0 (zero)	Default
Ctl R		Restore Settings
Ctl +		Memory (store) settings
Alt S		Setup

Alt P		Start Preview Scan
Alt ESC		Cancel Preview Scan
Alt KP_+	Zoom in
Alt KP_-	Zoom out
Alt KP_*	Zoom not
Alt KP_/	Zoom undo
Alt A		Autoselect scanarea
Alt V		Select visible scanarea

Alt I		Histogram lines for intensity
Alt R		Histogram lines for red
Alt G		Histogram lines for green
Alt B		Histogram lines for blue
Alt M		Histogram lines mode (line/pixel)
Alt L		Histogram lines logarithm