left mouse touch select accessory (move on top)

left mouse drag move accessory

mouse double click copy accessory

mouse wheel over accessory rotate palette

shift + mouse wheel rotate accessory

ctrl + left mouse click reset palette

shift + left mouse click rotate&scale mode

keeb arrows move selected accessory

ctrl + keeb arrows move selected accessory precisely

+/- scale selected accessory

ctrl + +/- scale selected accessory precisely

Y yabe selected accessory

space honk (source)