How do I make -Heapsize and -dxlevel 90 changes permanent?

[supersaint]

I like to set the Heapsize in the advanced options so the game uses more RAM to load game textures, but when I do that in the Advanced options box, I get a stupid error, and the only way to get the game to reload is to go back to the advanced options box and type - dxlevel 90 so the stupid game knows to start in DX9.

Is there any way to make these changes permanent so I don't have to enter them every time?

I can't enter the - Heapsize command at all now, because the game crashes if I don't have the - dxlevel 90 command in the box.