Yes some keys are changed, but I think for the better.
I have changed keys so many times now though
Im sure it uses the arrow keys to move you and your cam.
The - + change TC (perhaps as with stock) and enter is now return TC to 1
Im not sure what other keys are changed as these are the only ones I use
The sounds added by the mod itself are woth learning new keys for.
Just watch some of stoianm's vids to heard for your self - he uses that mod.
I was also put off by the German speach - but now I am starting to leard the key phrases - I could not play SH5 now without it