Patrick, Alan,
We briefly discussed this at the tail end of PUG 2018. Yes Yes Yes. Would love to see this enhancement for Corridor templates. Ultimately, similar function needed for Utility Trench templates also.
My work around right now, in corridor templates is to use conditional IF instructions, with a start and end, (that you can Name) that is always true, and then group template sub components into them. Being able to Group and organize in a Tree structure would be much better. And then further, export, import, saved Template groups even better again. Cheers, Jake