Add control + left click allows to move around white space and line should connect like arrow does

using scroll button in mouse for moving around is not very great experience as it could easily scroll away even just a liitle it gets annoying and no one want to really use scroll button other than scrolling so control + left click is better option in my opinion like control + scrolling for zoom in or out. For line i want it to conect like arrow and i was thinking mostly people only use line for horizontal or vertical line so introducting a faint horizontal and vertical line would be beneficial for it. And if posiible there could also be a way to mold the boxes cu sometime i wanna get creative a make like a 3/4 pizza box like structure.