+1
Yes please. This is effectively blocking me from using TLS on my MC server.
I should note: It might also make sense to build the certbot functionality into MC entirely. They could do all that for you and give you just a checkbox and fields to configure MC to automatically work with Let's Encrypt. That would make it more approachable for regular folk, which is (after all) the goal of Let's Encrypt.
But Let's Encrypt and certbot are all open-sourcey and whatnot. JRiver could just hide all that complexity (like they hide the complexity of using LAME). Then MC could serve the port-80/443 domain validation file (just long enough to complete the renew when it needs to do it), and all that and make it easy for everyone.
In any case, I'll set it up with certbot, but not till I have a way to automate MC's ingestion of the renewed Certs. Because doing that manually every 3 months is the stupid.