This is related, but in the opposite direction of another question:
Are questions about getting emacs-like behavior in other things on topic?
Personally, I feel these types of questions should be on-topic as I've already asked one here:
How to auto-save buffers when Emacs loses focus?
But I figured it was worth asking as these types of questions could be contentious.
I believe they are on-topic.
You are asking about how to provide feature x in Emacs. The fact that the feature is in another editor/application already simply gives a better frame of reference for what behavior is desired.
I feel however that the question should still describe the desired behaviour well enough to be understood without knowledge of the other application/editor.
Given that asking about some imaginary feature X is on-topic, I don't see how the fact that the feature is present in this or that editor renders it off-topic.
I personally see those kinds of questions interesting, specially for beginners. When I was learning Emacs, it was quite common for me to ask someone 'how can I do X-like thing from visual-studio in Emacs'. I could say most of the times someone told me the 'emacs-way' of doing the same task, which was not quite the same, but way superior.
