Windows has 2 sets of Copy/Cut/Paste shortcuts by default. The most common of course are
Shift-Delete are also Copy/Paste/Cut respectively.
I've been using the latter set since they were available in MSDOS EDIT
In any case, the latter set don't work in the SE Data Exchange query editor. In fact, worse than doing nothing, pressing Shift-Insert toggles typeover - so when you do press CTRL-V, it pastes over the top of your query.
I'd suggest the functionality should be replicated (at least for Windows users - not sure if this is common on Mac/Linux).