I have no problems with changing and saving keyboard and mouse config in NOLF1 and didn't see other people complaining about it but it's good to know there's fix for this issue.
Funny, I seem to remember that blood looked normal in the Contract JACK but I played it very long ago. I see the problem in CRES.dll. Official translator changed logic value in 1202, "TRUE" to "PRAWDA", unintentionally censoring Polish version and didn't realize his mistake. I've made exactly the same mistake in my translation of NOLF2 and enemies didn't bleed and bodies turned into some backpacks. Fortunately I fixed this problem. :)