The Find and Select functionality is very useful as it is but I think that there are a few improvements that can be made regarding efficiency.
Currently, accessing saved criteria sets is inefficient - open dropdown, select criteria set and then press select. Instead I would like to have a side panel with a list of all sets so that all that is required is to double click on a set to make the selection. This would basically be a integration of the Selection palette into Find & Select. If Selections current functionality needs to be preserved the new panel could have two tabs - dynamic selections and static selections.
Another improvement would be the ability to make a selection based on a criteria set populated with values from a specific element without opening the Find & Select dialog. So perhaps something similar to pickup/inject and element transfer settings. By clicking on an element one could access the list of criteria sets and choosing one will make a selection based on the chosen criteria set populated with values from the element. Perhaps there needs to be a distinction between populated and unpopulated criteria sets to make sense but it would be a very efficient but also powerful feature.