has anybody

X2
When I worked for High Performance Parts Outlet we always hung are Crankshafts...I do the same or I leave them in the block,for storing purposes...
On the brake rotors. every time we replace customer brake rotors with new,we machine them first and you would be surprised how many are warped out of the box...

x2 better in the block or on ends...and if hung, they better be hung on the mains and evenly loaded.

My only point in this is that it would take a LONG time for the crank to warp on it's side up on a shelf.