I think it's quite easy to implement and it will greatly help coloring compositions – for me these 10 available colors is way too little. I know everyone has own convention of coloring (like, magenta for input nodes, green for output, etc.) but especially because of this fact we need more colors.

Often I need to distinguish green window nodes but I also NEED them to remain green-ish (e.g. for many output windows). If I had, let's say, five tones of green I'd color 5 output windows and distinguish them without changing convention (that green nodes are video outputs). Same with interface nodes – five tones of magenta will allows an user to color keyboard input a little bit differently from mouse input, HIDs and so on. Look at the attached picture – IMO, the lack of colors forces an user to change conventions in the same composition.

Of course, one can have completely different coloring convention – so I think we need about 20-30 colors (4 tones of 5 colors, 5 tones of 6 colors, or something similar). And cascade, two-level tint menu with colors on the first level, and tones of this color on the second level would be perfect!

What do you think, guys?

You would be able to right-click on a port and choose from a menu of compatible nodes. The chosen node would be added to the canvas with a cable connecting it to the port.

Like Insert node between other nodes, this feature request intends to provide a convenient way to insert a node onto the canvas. The difference is that the other feature request is for dropping a node onto a cable or port, whereas this one is for a context menu on ports.