Improve Drag and drop and usability / readability of select dropdown in questionset configuration

The drag and drop functionality under management/questionsets/<id>/ is not working as expected. It inserts the dragged item not between two items but above the upper item, so in a row of

item1
item2
item3

dragging item3 between item1 and item2 would end up in

item3
item1
item2

There is also a lack of usability and readability when handling that drag and drop elements:

and also when select one of those dropdowns:

Expected behaviour / Erwartetes Verhalten

Expected outcome:

item1
item3
item2

And better usability of that configuration.

Steps to reproduce / Schritte zum Reproduzieren

Configure a questionset with dropdown selects.

Context / Kontext

RDMO 2.5.1