Say you want to select multiple non-contiguous items in a grid to act on - to paste a value in a field(s), or to add/change a value in a field using the properties pane - would it make sense to enable the ctrl+up/down keys for such a non-contiguous selection?  I see that we can do this using Ctrl+click, but I like to have keyboard options whenever possible.

I see that Shift+up/down and Shift+left/right work to extend/contract selection.  I know that Ctrl+left/right is used for collapse/expand.