This feature has the intention of making it faster to enter issues, but unfortunately it does not.
Everything about it seems harder or broken. Even trying to click in the description field is hard
I cant navigate dropdown lists quickly like I can elsewhere. If I have a longer list that has three items starting with the letter "S", before I could hit "S" twice to select the second entry starting with "S", now I have to type the name of the thing which takes longer.
TAB does not select the highlighted entry and move to the next field. I have to click the thing with the mouse and then hit tab.
There are other issues as well regarding screen real estate usage and other navigation. JIRA team please take this feature back to the drawing board and really consider what it is that you are trying to do before trying to force this time wasting thing on us.
I would have logged this as a bug, but thats not working for some reason.