SNOW LEOPARD change time machine interval?

Has anyone figured out how to change the time machine backup interval in SNOW LEOPARD?

i don't want a third party app or anything, i just want to go in terminal or textedit and set a new interval.

for any of you who are going to tell me to modify the com.apple.backupd-auto.plist file. i cant find one, and i believe this is unique to 10.6. there is a regular backupd.plist file, a -wake.plist, and -attach.plist, but none of them list the "start interval" key that i saw.

any help on this one?