I would love to be able to set some seasonal rates to be relative to other seasons instead of a hard-coded number. For example, it would be great for Labor Day Weekend to just be 10% higher than whatever September is set to, instead of having to update 2 separate numbers. I realize this can be achieved by building a spreadsheet to do all my calculations in, and then import them. But it would be super handy to be able to skip that step.
If not mistaken, this can be set up in Pricelabs if you use it.