Hi @kOS 
Can you share what exactly confuses you between the two wrenches? They aren’t editing features per se? They are (as I see it for the most part) moderation features.
I’m sorry if it looks like I’m preaching to the converted here… 
. The easiest way to remember what each wrench controls is by the placement.
The 
on a post is for posts. For example adding staff colour to a post
The in the topic is for actions surrounding the whole topic instead of a certain post. For example, unlisting.
Unless you are referring to:
- the pencil icon (on the post)
- make wiki (in post admin actions)
- enable shared edits (in post admin actions)
All of these do slightly different things (one is a plugin) You can read more below:
Each admin wrench (post & topic) serve a specific purpose so in my opinion it would be a bad idea to merge them together.