Here's a list of what I propose:

1. Repeat # times (Do I need to explain why?)
2. Repeat until # produced (Used for crafting multiple items in succession.)
3. Repeat until x signaled (Used in combination with the 'Globally signal x' or the 'Signal x' command)
4. Make noise x (Makes a noise for the player to hear... nothing else.)
5. Signal x (Used to signal within the worker's code.)
6. Globally signal x (Used to signal to self and other workers' codes.

And here they are in some examples:

I feel that some of these would be very helpful mid game, or even early game! And that the other few would  be neat and fun to use.

I hoped this was helpful to the dev!