Creating a custom Russian keyboard

[Alan Shank]

I have Ubuntu 11.10. I looked at all the available Russian keyboards in
System Settings/Keyboard/Layout Settings and none of them is quite like
my Cyrillic Keyboard I use on Windows. I work on both computers, and
it's going to be a real pain if the two Cyrillic keyboards are
different.

Is there some way to modify the key assignments on one of those
keyboards so that they match my other one. There are only a couple of
keys that are mis-placed (for me).

Or, is there some way to create a custom keyboard;
I have the Unicode values for Russian letters.
Thanks,
Alan Shank
Woodland, CA