Trashing an image already works with ALT+T or DEL. We could add a trash icon in the tool bar for mousephiles. A single-level undo would be nice BTW, in case of a mis-click/keypress.
Sorting via d’n’d is always a bit tricky. Discoverability is one thing. It also clashes with current functionality. A left-drag moves the picture, if it’s larger than the window. A right-click shows the context menu.
One solution would be to have a representation of the current picture in the toolbar and d’n’d that. Doesn’t work when the toolbar is hidden though.
And generally, you’ll have to have the destination visible (open Tracker window or folder icon).
What would be nice: “Copy to >” and “Move to >” items in the File and context menu like in Tracker, complete with a “Recent folder” item plus the Tracker-global “Favorites”.