I am playing on laptop so I cannot use the numpad + and – to control the game speed. The regular + and – on the keyboard does not work. Help in the game shows that you can only use “Gray +” and “Gray –“ to control the game. I tried using program “KeyTweak” to remap numpad + and – to another keys in registry but the game still does not respond. Is there any way to remap the game keys or is there a command that I could use in game console to speed up and slow down the game?

EDIT:
i have found the solution in blitzkrieg forum:

there is a file called conf or defconf in game directory. i found both files, they seems to be the same and editing conf worked for me. files location is: C:\Program Files (x86)\Steam\steamapps\common\Stalingrad\

It contain key bindings that look like this
<item>
<Name>game_speed_inc</Name>
<Type>event down</Type>
<Controls>
<item>NUM_PLUS</item>
</Controls>
</item>
<item>
<Name>game_speed_dec</Name>
<Type>event down</Type>
<Controls>
<item>NUM_MINUS</item>
</Controls>

just chnage NUM_MINUS and NUM_PLUS with other key codes (K and L in my case).
Dont forgte to delete original empty bindings for they new keys.