Yes, you can. But first try to backup your installation. Then build a DSDT.aml file from your BIOS and place it on your Desktop. Run MultiBeast and check the UserDSDT check box. Then copy the DSDT.aml file from Desktop either to root from your snow leopard installation or to /Extra folder. ( On my PC it is working only in root ). Restart the computer.
If you want to use an another DSDT.aml file, then replace the first created file with this second one.
Restart the PC. It is possible, that you become kernel panic. If this is the situation for many times, then you have to delete the second DSDT.aml file and first replace it withe the first ( from your BIOS created ) file. This is possible from your Mac OSX installer DVD, with his Terminal application ( menu Utilities submenu Terminal). Delete with the Terminal the DSDT.aml file and replace it with the first one. Repair permissions with Disk Utilities ( from Installer too ) and quit the installer, restart your computer.
If you want to return to your initial EasyInstall setting, so you must delete the entire /Extra folder and the DSDT.aml file too. Then run again the Multibeast application this time with the checked EasyInstall check box and all the other settings to restore your /Extra folder and the catches and the permissions.
Success! If you need more explanations, then ask me.