I seem to only be able to place the powered detector rail in the positive X direction and the negative Z direction, meaning the minecart can only be launched in those directions. Relatively small issue but still quite annoying.

Using 1.1.0 for 1.20.1.

Hi, you should be able to shift+right click the rail once placed, to turn it 180°.
Please let me know if this works or not, so I can close the issue or look into it otherwise.

Ah yep, that worked! It may be worth putting a note under the item to make it clearer how to reverse it, but thanks for the response anyway!