It can, in fact, for OpenSprinkler latch, it always opens simultaneous zones one after another because latch controller needs to recharge the booster circuit before opening each zone.
What you are asking is different from station delay — station delay only applies for sequential zones, it does not apply to parallel zones. OpenSprinkler is not designed to open a large amount of zones simultaneously. How many zones are you thinking of opening simultaneously? If it’s just 2 zones, I don’t think there is any need to stagger them as the in-rush current isn’t very high. If you are thinking of master zone and a regular zone, please note that there is already a master on adjust parameter, which you can set to either positive or negative, if you want the pump to turn on a few seconds before or after a regular zone.