If you plug in an external USB keyboard, it'll work I think. The standard keyboard will get around 3 keys (iirc).
Try downloading 'AutoHotkey'.
Modify this script and save to 'tomb4_level_cheat.ahk'
Code:
; Run every line
Critical
; Avoid warning dialogue about over-hits
#MaxHotkeysPerInterval 50000
#HotkeyInterval 1
; epsxe joypad
PS1_TRIANGLE = a
PS1_CIRCLE = s
PS1_X = d
PS1_SQUARE = f
PS1_L1 = e
PS1_L2 = r
PS1_R1 = c
PS1_R2 = v
PS1_LEFT = NumpadLeft
PS1_RIGHT = NumpadRight
PS1_UP = NumpadUp
PS1_Down = NumpadDown
PS1_SELECT = q
PS1_START = w
; TR4 - level skip cheat
$z::
{
SendInput {%PS1_L1% down}
SendInput {%PS1_L2% down}
SendInput {%PS1_R1% down}
SendInput {%PS1_R2% down}
SendInput {%PS1_UP% down}
SendInput {%PS1_TRIANGLE% down}
Sleep 25
SendInput {%PS1_L1% up}
SendInput {%PS1_L2% up}
SendInput {%PS1_R1% up}
SendInput {%PS1_R2% up}
SendInput {%PS1_UP% up}
SendInput {%PS1_TRIANGLE% up}
Sleep 25
return
}
Change the keys to your setup, double-click the 'ahk' file. You'll see a green 'H' icon in the bottom-right taskbar.
Once in-game, hit the 'z' key (or change it) to enter that sequence of joypad commands.
Make sure to right-click the 'H' and close when done playing.
I've done something similar with the FF9 blackjack cheat with success.