I have been requesting an option to actually "choose" an open spot in other games. In my case it wasnt always for hunting the early spots, but for a coordinated fleetchange matching terminating leases. So far no joy :-)
You can do this now, in a way.
Just order way more than you need. It'll give you every possible spot you can. Then you can select "Skip this Order" on the ones you don't want. In that way you can only take delivery on the days that you want to, whether that be an order that starts 24 months from now, or maybe one every 3 months, or whatever.
It's a tiny bit more time-consuming in that you actually have to pick the days you don't
want a delivery rather than just the ones you do, but it works just fine.
There is the slight chance of orders slipping though if someone cancels. That part sucks. But orders don't move around too much.