Do a search query on 'Revit Text Editor' and you're bound to come across a whole heap of discussion on the subject (99% of it is complaints aimed at Autodesk).
Whilst I am just another Revit user with the same wish, there is one element to text and arrow leaders that is continually on my annoyance list....text leader elbows.
When you create a text string with an arrow pointing at something you may create an elbow in that text leader. The problem though is when you want to move the text, say to justify or bring text further or closer to the detail, the leader elbow moves too! And it shouldn't!!! Then you have to go back, grab the elbow and slide it back to 90°.
My (wishful) prediction for text editor updates in Revit is 2018..... hey, I did say wishful!