Use case: I just discovered the Dashboard template, and prefer its look and feel over the Form I’ve already built. After creating a new Dashboard-based form, I can copy and paste supporting code easily enough. I don’t see any way to copy and paste the components themselves, though.
In principle, this might be done by manually editing the Export/Import file, but that sounds rather risky.
I just tried it - selected a control from one form and copied (ctl-c) & pasted (ctl-v) it successfully to another.
And from one project to another.
Unless I’m misunderstanding?
You can drag to multi-select but you can’t shift or ctl-click to multiselect.
You can, in fact, Ctrl+Click to select multiple components 
As David says, it’s Ctrl+C to copy, Ctrl+V to paste, Ctrl+X to cut. (That’s on PC - I believe it’s the Apple key on a Mac.)
(Perhaps you were confused by the Dashboard template, because all the main page content is inside one big ColumnPanel - so if you miss the component you’re aiming for, you will sometimes select that instead. It does work if you click in the right place, though!)
Mod note: Moving to Q&A forum
I was trying to use an everyday right-click (pop-up) menu to do the copying, but nothing popped up. Ctrl-C gave no indication that anything was happening. (Discoverability could be improved.)
Thanks to your suggestion, I’ve now tried ctrl-c and ctrl-v, with limited success. The control does paste into the Dashboard form. Thus far, I have not been able to paste into the navigation panel, which is where I wanted to put it. Unlike pasting from the Palette, I did not find any way to see where this kind of paste is going to end up. In this case, it ends up in the panel to the right.
But if I take pains to move the mouse very carefully (selection borders seem to be only one or two pixels wide), it appears that I really can grab it from there and drag it into the navigation bar.
So it is doable, after all. But I could suggest improvements to the visual feedback, so that developers can more readily know
Thanks, all.
>> You can, in fact, Ctrl+Click to select multiple components
Tried that many times and it didn’t work. Just refreshed the page and tried again - works.
Ah, the joy of the browser … surely can’t have been my fault
The pasting is a bit odd, I do agree.
I don’t seem able to choose the target container; I paste it into the form (the only place is seems to go) then I have to drag/drop it to its desired destination.
Would be nice to be able to select the container either by clicking or, where that’s a little too imprecise, selecting it via the drop down on the properties panel of the IDE, and paste into that.