Hi, this thread wasn't locked and since it was brought up 2 years ago, I'm replying to this instead of making a new request, as I'd like to make a case for Voices and above being able to use /requestshow.
As it stands, on a room level I don't think this is inherently something that needs to be changed. Room Staff should have a good level of judgement of which users they want to be able to use !show. This becomes a grey area with Global Voices, however.
As a Global Voice myself, I've been involved in numerous rooms and I normally opt out of using !show in some instances because, as a Global Voice, I am not involved in the culture of said room, and I don't know what their staff want. Some of the rooms I've been in would prefer that I ask a staff member before using !show - not because of any concerns about what I may post, but because of a consistency regarding who can show what in their room. In fact I had a conversation with a Room Staff member of Wi-Fi, which I am not roomauthed in, and they said they would prefer I ask before showing anything - which in my eyes is completely understandable.
On a general scale, I kind of do think it's courteous for Global Voices to ask before showing things if they aren't involved in a room, but that might moreso be personal preference. That brings us to now, is that if I'm going to ask for media to be shown, why not be able to use /requestshow, since that's kind of the purpose it serves?
Edit: To be clear, the idea does not reflect the opinions of the Wi-Fi room. I only mentioned this as an example, but /requestshow would actually be useful in this instance.