Yeah, definitely something I think helps streamline Krita. I had created this feature request to also help consolidate tools: Merge Select Shape tool with the Move and/ or transform tool
I think that adding some context sensitivity for similar tools and context dependant options (i.e. close a polygon when you click the startpoint, otherwise it remains a polyline) would also do the trick.
Offtopic: Also interesting that the manual notes a recommended mass setting of 0.02 for the dynamic brush, whereas the default is 0.01.