At my circus group last night I met a young lad who could stagger around in a handstand for 10-20s and clearly had decent "strength", but he couldn't for the life of him hold still. I demonstrated a static handstand (my line is poor by GB standards but I can stay up for 10-60s, depending on my strength) and suggested that my hand orientation was key to being able to balance using finger pressure - a fundamental concept, of course.
In his handstand his hands were rotated outwards 90 degrees, kind of how some might do a planche or elbow lever, and this seemed to give him almost zero front/back control. He said that he then, though, had better side-to-side control... which to be honest I didn't think was ever an issue for most people.
We didn't discuss it much further, as I don't really feel justified in giving out too much HS-specific advice considering my own lack of accomplishments, but I thought I'd investigate further and maybe refer him to this forum.
Is having your fingers out to the sides ever done? Can he work with that, do you think, or is it a dead end?