I use arrows a lot and it would help me if I could set the direction and where the head is by the way I drag the rectangle when creating the arrow.
For instance, if I click and drag downwards to the right then the arrow would also point downwards with the head on the right hand side.
A similar intelligence could be added to the curly brace. If I draw it wider than taller then it would be horizontal. If I dragged the rectangle upwards, it would point upward.
Just a thought :-)
Thanks,
Petr