To do this after you compile your final game go to the setup config open it up this will be in your folder with your game's .exe, go down to where it say's
[GAMEPROFILE]
title=gamebankmygametitlepage.fpi
global=gamebankmygamesetuplevel.fpi
gamewon=gamebankmygamegamewon.fpi
gameover=gamebankmygamegameover.fpi
key1=17
key2=31
key3=30
key4=32
key5=57
key6=46
key7=28
key8=56
key9=16
key10=18
key11=42
---------------------------------------------------------
key1 = move foward
key2 = move backwards
key3 = strafe left
key4 = strafe right
key5 = jump up
key6 = crouch down
key7 = use action
key8 = reload
key9 = peek left
key10 = peek right
key11 = run mode
just change to key to whatever scancode you want to use like in dbc/dbp
for your reload to be alt change key8 to key8=56, for it to be del key change it to key8=83.