I completely agree I also think it would be nice if arrows wouldn't disappear after making a move, this is particularly annoying in puzzle/ solo chess.
ps: I've been looking for an answer to these questions for some time now any help would be greatly appreciated.
Sorry if that has already been posted.
The arrows you can draw on the board are too fat and often its hard to distinguish them when there are many arrows on the same line or pointing to the same square. It would be nice if the arrows were skinnier.
Also it would be nice to be able to draw different colored arrows using modifier keys (ctrl, alt, shift, etc) along with right/left click.