Just a workflow thought.
A movable PRT gizmo would be nice that shows the slice of the percentage of particles in the viewport. As is when the Viewport->% of Render is set to the default of 1% the PRT only show particles of the leftmost region. A view slice type gizmo (ie a plane or something similar much like the e-poly slice gizmo) would be nice to move across the region to examine the internal densities of the PRT. If the percentage is say 10%, you would get 5% on the left and 5% on the right side of the gizmo.
It is already implemented, for instance when you use a box as a particle cull object, except you that you don’t need to make a box, alter the properties to display as bbox, untick renderable, add it as a culling object, deselect the PRT, select the box, move the box, ect. ect.
EDIT: I did see the information on the 3ds max deformation gizmos and how they may not scale properly with a PRT since the bbox may alter during the course the playback. So this maybe a moot wish.
