It does the same thing, with and without the num lock light on.
Please forget Num Lock & the Number Pad keys. The numbers you want are the ones on the keyboard itself, above the letters Q, W, E etc. Hit Shift + E first. Then release Shift + E & hit the key(s) to open whichever exit(s) you want to open. You must do this within a fairly short time period for it to work.
I found a section thaty says
[exits]
number_of_exits=4
exit_rate.0=0.1 ;Percent per second
exit_rate.1=0.05 ;Percent per second
exit_rate.2=0.2 ;Percent per second
exit_rate.3=0.2 ;Percent per second
wouldn't the answer be in here somewhere
These entries define the number of functioning exits in the particular MDL. I don't thinks it's possible to modify them. The doors might not open if you change anything.