Custom intervals? Like, setting each rule to its own interval? (could be very handy if you want one rule to fire slower than another one... so a rule set up to catch a big swing can fire off faster than the every-day slow one, to take most advantage of the swing before it swings back)
No. You will be able to add "Empty" rule witch just holds next rule executing by some ms.
So you can put this empty rule between required two rules and make interval.