I'm not sure if you can ignore SD, the best you can do is extending round time to 127 minutes. Also, I don't think you can specify an amount of how much should be fall damaged increased with, you can specify a percentage though. I don't have WA here, but I'll give SchemeEddy a try.
Edit: Try this one. I've set FD to 220% (as for: 51-46=5 FD is now 57-46=11 FD [11/5*100=220])