1: Request to merge similar or same ideas / feature requests. With option to add onto the idea. For example an idea I saw was to generate first name and last name. How about merge that idea with form fill and generate whole persona like website https://www.fakenamegenerator.com/.

Maybe comments are already sufficient enough for this. "Changes to existing features" sounds like it could be this or already implemented features.

2: Make it easier to identify the "enter your idea" is also search for ideas.