This is the current wording from my article, which will eventually end up in the updated Style Guide:Sounds like a fine compromise to me. Thanks!
"Commands the execution of which requires the user to provide further information should always indicate this with an ellipsis at the end of the label. Also, if the programmer wants to specifically indicate that there will be an opportunity to cancel (for instance, in delete-type operations), the ellipsis can be used. The user may feel safer clicking on unfamiliar commands if he/she knows they just bring up a requester."