Using Khmer Unicode Ratanakiri Keyboard Layout Version 1.0.0 you don't need to switch back and forth between CA or KM and EN any more if only you want to input some special symbol like "-", ":" ...

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Is totally based on Khmer Unicode Keyboard (NiDA 1.0) and added the following keys:
Ctrl + - = -
Ctrl + + = =
Ctrl + ; = ;
Ctrl + ' = '
Ctrl + [ = [
Ctrl + ] = ]
Ctrl + \ =
Ctrl + , = ,
Ctrl + . = .
Ctrl + Shift + - = _
Ctrl + Shift + + = +
Ctrl + Shift + ; = :
Ctrl + Shift + ' = "
Ctrl + Shift + [ = {
Ctrl + Shift + ] = }
Ctrl + Shift + , = <
Ctrl + Shift + . = >

This keyboard layout tested and installed on Window XP and Window 7.

Please provide me more comment to improve this keyboard layout more easy to use :)

hengsovann(at)gmail(dot)com