It would be a a great feature to have something like a "timeline" showcasing what orders may overlap.
Ex. Many page view events all have the same order. When creating the rule and selecting the event, you can see what if another rule is set to the same order.
DOM Loaded Event
<-----------"order 10" has 3 overlapping rules------"order 20" has 1 rule"------"order 40" has 5 overlapping rules-------DONE->