Sticky "plus" icon for map and list entries

[nikita-kart]

Is your feature request related to a problem? Please describe.

When working with long arrays of values in properties panel inside input or output variables, it can be annoying to scroll up and down to add and fill new values in list or map entries.

Describe the solution you'd like

It would be nice to have a "plus" icon of list or map be sticky to the top of the panel like with general Input or Output tabs so you don't have to scroll up and down constantly. Maybe whole "Map Entries" title with its control buttons (see edited screenshot below) could be made sticky.

Describe alternatives you've considered

Click every single entry to fold them so I don't have to scroll but it's not very convenient either and hides values which I need to look up sometimes.

Additional context

I quickly sketched how a panel might look like when list of entries is scrolled down if implementing suggested solution:

[barmac]

I think this idea makes so much sense! Thanks for creating the issue.
CC @lmbateman