No, I've been using this Sticky Key function for at least 10 years.
However, I just tested out on my Mac mini and this feature is gone in Sierra. One click Sticky Key is still working for copying and pasting (without holding down Command (⌘) Key + c or v) and maybe some other shortcut. I updated my MacBook Pro yesterday and I thought some of the keyboard settings were changed, but now my updated Mac mini also doesn't work. Just to make sure, I also tested out on my old MacBook, running 10.6.8, and yet it works like a charm.
Opening a link in a new tab with just a click of Command (⌘) Key + left click on a mouse (without holding down the Command (⌘) Key) was one of my favorite feature for Sticky Key but it is GONE in Sierra. Apple needs to bring this function back. I do not want to hold down the Command Key!
Anyway Kappy, thank you for trying to solve this problem.
🙂