Relevant paper, for those of you who are interested.
Horizontal pupils in goats would allow them to orient themselves well on flat terrain, expanding the viewing angle,
Horizontal pupils are largely (though not exclusively) found in grazing animals whose eyes are on the sides of their heads. Without those side-mounted eyes, there's a much reduced scope for improving fields of view.
vertical pupils inherent in ambush predators would allow them to estimate the distance to the target as accurately as possible.
The theory seems to be that having vertical pupils creates a slightly different depth of field to that presented by round pupils, making it easier to establish distance (roughly speaking, it increases the blurring of out-of-focus horizontal features, things which are hard to calculate distance of using stereo vision alone). The problem is that by adding a horizontal aspect to your newly designed eyes, you've effectively undone the advantage that the vertical pupils may have given you in the first place, because you're partially undoing the astigmatism that the vertical aperture gave you (and maybe introducing some new distortions, too).
Note also that the vertical slit pupil is limited to species who are predators with their faces relatively close to the ground, as the benefit of blurring of horizontal features decreases as the angle between the line-of-sight and the ground increases. That's why birds which might want to ambush ground-dwelling prey without smashing themselves into the ground just go for round pupils, and perhaps why humans have them too.
So, maybe it would look cool, but in practise it seems unlikely to have any particular advantages, and may in fact make vision slightly worse as well as requiring a more complex iris.