David,
Please have a look at
tocar. It isn't supposed to be a stem changing verb. There are others that conjugate like
tocar with the same problem; e.g., abocar, achocar, chocar, etc.
You understandably have a long dash, indicating a non-existent conjugation, in the first-person imperative slot. Is there a way you could do something similar for non-existent conjugations in verbs like
llover,
gustar, etc.?
Thanks for all your hard work!
Rusty