Damn this looks cool. I always want this kind of flexibility. I'm using both Jetbrain products and VS right now, and one pain point is that it's difficult to define new short-key combinations and assign a key to it.
With Vim you basically just tell it to map any sequence of inputs to any other sequence of inputs. If you know how to do something in Vim you can define a keybinding for it. And because Vim is 100% controllable via the keyboard you can bind anything to a shortcut.
Little confession: I have no idea what e.g. the difference between "nmap" and "nnoremap" is. But after years of randomly mixing them in hundreds of bindings without a noticeable difference it doesn't seem to matter. Just use map, nmap, imap and vmap, avoid duplicates and everything will be fine imho.
The default behavior is to recursively expand and apply your mappings and "noremap" disables this recursion. For example if you do something like
:map j k
:map q j
:noremap w j