FME4Y_CQC has written
is in controls.lst or controls.cfg?
Both. First type this in
controls.lst:
1
"weapon 74; attack2; attack2; [i](Your choice)[/i]"	"Quick Build"
Then type this in
controls.cfg:
1
bind "L" "weapon 74; attack2; attack2; [i](Your choice)[/i]"
F.Y.I.:
Replace (Your choice) with either slot3, slot4 or slot5.
Edit:
@Tony Scorpio: Command doesnt exist.