We use lag and lead times in all our construction projects. When starting a new project, we clone one of our structure templates with the issues to a new project. With around 250 issues and roughly 350 links, it's a great pain to find all the links which should contain lag or lead times.

We also use scriptrunner a lot. So if there was a way to set lag/lead times by some api it would save us a huge amount of time!