The ability to select several ports of the same data type (for example with cmd+single click) and then hit the return key to get an Input Editor to edit them all together at once.
To make sure I understand correctly — you want a single input editor to pop up for all selected ports, and editing in the one input editor should affect all the ports, right? I’ll go ahead and open this for voting.
Related feature request: Ability to detach constant value flags and connect them to multiple nodes. That approach might be better if you’re editing the same group of ports repeatedly, but this one would be better for editing a group of ports once without thereafter linking them.
Probably the biggest difficulty of this feature request would actually be adding the ability to select ports. Not sure yet about the interaction/gesture.