As for increasing the level cap, I'll copy/paste my post from another topic:
Open your ps_game.exe with a Hex Editor and search for the following offsets:
000540C7
000540F7
00054127
000547A1
000547D3
00054805
00058187
0005826F
00058342
000583D3
00072034
000831E5
0008AEEB
0008AF17
Now look for a value that is (depending on which ps_game you're using) either 3C (60), 46 (70), 50 (80).
The hexadecimal value for 100 is 64. The hexadecimal number can only contain 2 digits, so the max level would be 255 (FF).