Hello, I'm very new to Github, so I don't know where to specifically ask for requests. Also, I don't know if you're taking requests either; you're free to deny it. However, please know your mod is the only rails mod updated to 1.16, so I greatly appreciate your work!
The request I have in detail is just for speed rails. It could be done like the BetterRails mod, in that there is a greater variant of Powered Rails that uses iron. Alternatively, there could be another minecart variant that has a higher speed cap than a normal cart.
Again, I apologize if you are not taking requests, or you have discontinued the mod regarding features. I'm sorry if this isn't the place for requests, either.

No problem, you're in the right place! I'm going to look into making high speed rails and carts. Still debating high-speed pushcarts.

Added in the 1.1 update!