"The Spooky2-XM generator has been carefully designed to be immensely robust, and can handle continuous short circuits without complaint."
So far, I have not found any documentation that says you should not do this.
However, my interpretation is that while the XM5 is said to be resilient and tolerant to a short-circuit its not designed to work that way; ie. It may no longer function as a frequency generator. I would suggest to contact Echo just in case this will void your warranty.
The next best thing are the contact-mode DNA holders; these are not as quick-acting as the remote; or the remote with magnet; but they do work & may still have applications for experimenters:
For more details, please check the link: