I know Musescore has plugins that add analysis objects to Musescore, but what I am missing are typical Berklee analysis objects, like curved (dotted) arrows and horizontal (dotted) brackets. For the brackets we can use a workaround like pedal markings, but a curved arrow is sorely needed. I tried working with an imported graphic of a curved arrow, but resizing it in a flexible manner is almost impossible.
Can you link to a reference on Berklee analysis so others can know what you mean?
Resizable curved arrows are not a thing currently, so workarounds such as you are trying are the only way I would know to accomplish that.