Pasting a single element to multiple frames is a huge pain right now. I have to manually select each frame one by one and paste whatever element I forgot to add. There are no plugins I am aware of to make this easier.
My dream would be to copy an element and then select a group of frames. Then have a right-click menu to “Paste to selected frames” which would paste the copied element to all selected frames. Positioning, prototype links, and resizing constraints would be respected just like a normal paste.