It sounds like you want a perspective that applies the expansion settings to whatever folder you click on, is that right? I don't believe you can do that, as my recollection is that when you make a perspective with one of the restore boxes checked, OmniFocus makes a list of all the attributes as they are at the time the perspective is saved. So, if you make a perspective that restores expansion and there are three projects shown in that perspective, there's a list tucked away that records which of the three were expanded. When you switch to a different selection, even though the window suggests the perspective is still active (the view settings are) no attempt is made to alter the expansion from how OmniFocus thinks you want those newly selected items expanded (the way they were when you last viewed them).
It's akin to the problem of using diff to describe a set of changes to a file. Diff will say the equivalent of "at line 3, you inserted <xyz>", "at line 7, you inserted <xyz>", "at line 10, you inserted <xyz>", but it doesn't have any way of saying "every time you had <abc>, you inserted <xyz>" and so if you applied the diff to a similar file which had instances of <abc> at lines 2, 6, 9, and 13, you wouldn't get the new file completely updated. OmniFocus does the same thing: if you make a perspective that shows the contents of a folder, with all of the projects collapsed, save the perspective, then add an expanded project to the folder without updating your perspective, each time you open the perspective, you'll get the original projects, collapsed, plus the new project, expanded.
Conceivably, the description method OmniFocus uses could be extended to support specifying the two most interesting states (everything is expanded, or everything is collapsed) so that you could make a perspective that could be applied to any selection with equal effect. Seems like a 2.0 sort of change to me.