Extreme toe-in is recommended by several acoustic consultants and hifi reviewers. In such an arrangement, the acoustic meeting point of the speakers happens several feet in front of the listener. This has a few advantages.
1) It widens the sweet spot as on-axis image response happens at the opposite ear ie left speaker right ear and vice versa. Or it might be even off-axis. A wide sweet spot where the stereo image stays relatively constant over 3-4 feet horizontal plane might be preferable over a narrow, locked-in center image, especially if the sweet spot is catering to more than one person.
2) This kind of speaker arrangement decreases or delays early side-wall reflections ensuring that entire acoustic energy reaches the listener's ears. I have found this to be a inexpensive type of room correction with some of my speakers.
3) Last point is related to psychoacoustics and the way the brain perceives the mono signal that is heard by each ear and converts this into a mono center image. For reasons I don't understand, this apparently results in an increase in the depth of the soundstage as if the center mono image is several feet farther away from the listener in the sound stage.
Of course, all of this depends heavily on the listening room and off-axis vs on-axis response of speakers.
I have also heard that the D'Appolito driver configuration (tweeter in between two midrange drivers) in QAcoustics speakers lend itself well to this kind of extreme toe-in. I have tried it with my QAcoustics 3050i speakers and I see an improvement in the center imaging but no difference in depth or width of sound stage.
Anyway no harm in trying if this works with your listening space and equipment. Hope this helps.