If you want, I can get you a modified "KBDRU.DLL" which will make english letters correspond to russian ones pretty close, such as english 'a' will be equal to russian 'a', 'm' equals 'm', etc.. All you'll have to do is to replace the "kbdru.dll" in \Windows\System32 with the one I give you and switching between different keyboard layouts will be a simple as just pressing CTRL+SHIFT.
Let me know if you'll want that file. Send me E-Mail or PM. Udachki!
-- Andrey