I will be trying to make the races easier to add.

I will make more commands for you to use. These include possibly a few wrappers for effects, and adding timers to the queue, checking the timers in the queue, etc.
The timers queue is important because it allows you to stop things from carrying over into the next round. This prevents unnecessary bugs from happening inadvertantly.

There will be more events added to what the races are allowed to use (player_jump is coming for sure!) I see no reason why all the events wont be added. They just weren't added yet, because the default races didn't use them.

This list will grow as suggestions come in.