Just as an fyi we already discard closely grouped stars so the "globular issue" isn't really an issue. We look for well defined distinct stars. This also helps to reject many galaxy cores and other non star things.
And yes, we're one of the only applications, to my knowledge, that does entire frame auto focus...and we've had that since day one. We feel it makes a pretty significant difference in terms of speed and accuracy. You'll always get the best overall average focus with our algorithm, regardless of your optics. Now if thats what you want (ie badly curved optics with a daily in the center) well that's another discussion.
Thanks
Jared