Removing the widgets while rendering a screenshot would be trivial.
As to the in-game widgets, I do wish/plan to make them more window like, they can be moved already, the minimap supports scaling already, but there is no way to trigger it.
So if any pixel-pushers out there can come up some decent looking buttons I'd be delighted to incorporate them. Different versions for 'small' and 'big' would be good, but small will need to be small, probably 16 * 16 pixels ...
For the buttons we would need: a minimise/roll-up, restore/unroll, zoom-in, zoom-out, & close.
Something to put on the 'title-bar' area would also be nice, to make it more obvious its draggable, a series of lines or dots is popular for this purpose nowadays.
In the future the regular console and dialog console may get put in widgets, and the debug info definately will, so some widget resizing indicators might be nice too.