I would like to be able to change link types all at once, similar to being able to changing types all at once. You can go to a parent thought and link all to children, so I think by this same logic you should be able to easily implement something like a change multiple link types at once. I use this a lot for families and showing lines of succession. I have siblings and spouses, children, etc. Having something like this would quickly be able to make my link type visible as something like "Sibling", "Parent/Child" or "Spouse". Out of everything TheBrain14 offers I think this is the biggest thing that could really speed up workflow. People will quickly see the benefits of having something like this.

I would also request a way to search through link types quickly, but I don't really have a solution for that. Currently I have around 100 link types and scrolling through the list every time to select one quickly eats up time.