I think its high time that a proper shuttle coaster, like a Schwarzkopf shuttle loop, or a Premier Rides shuttle coaster, was added to Planco. It really seems like a no brainer to include this.
I was actually just looking for discussions on Premier Rides shuttle launch coasters (ie. Mr. Freeze and Batman and Robin the ride at Six flags parks). Mr. Freeze in particular is a great ride and I'd love to build my own boomerang launch rides where the coaster is able to run backwards through launches (and the launches would need the option to apply brakes on the second pass through). This would be similar to the Impulsion already in the game but of course not a suspended coaster and the brakes would not be determined necessarily by station passes.
I really dont know why Frontier has this sort of weird eversion to shuttle coasters. It seemed only logical to include the traditional shuttle loop when the SLV was added, instead all we got was the Wiener Looping style of launch, which is only seen on the eponymous Wiener Looping coaster.