The following are other efforts in creating simulators that can be useful.

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Synthesis by Autodesk

The most advanced robotics simulator and it's open-sourced. Optimized for FRC simulations, this one is most likelly to be the de-facto standard of FTC once someone decides to mod it for FTC use. They do have a Velocity-Vortex field, you can import robots from Autodesk and a whole bunch of other features. If you're looking to help the FTC or FRC community by suppporting a simulator, I recommend putting your efforts into this one.

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MOSIM

An open-source and closed-source simulator (depends on the version). It is supported by a community which allows new members to contribute.t.

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FTC Team 12010 Relic Recovery Simulation

A unity project that the authors may donate to you if you ask. Also a good starting point.

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FRC Field Sim

Another FRC simulator.