Delivered in Sites 9
It only saves a click but when inserting content into a page in the CME, why not auto select the CT if it is the only one?
Personally, these two changes are like low-hanging watermelon to me. And yes, I have a blog post on double-clicking Components when making a page (it started out confusing but got better a few years back). ;-)
This improvement will be part of the upcoming Tridion Sites 9 release.
Another improvement: ability to add component on the page using double-click if applicable template was selected.
Indeed, that makes a lot of sense. In general, usability improvements have our attention for the upcoming release. This one is low-hanging fruit. :-)