Icon + Shortcut for 180deg rotate

[pstein]

I often need to rotate an image at 180 degrees (e.g.
after having scanned a document with a flatbedscanner).

It would be nice (and easy to implement) to include
a 180 degree rotate icon on the toolbar and/or a key shortcut (e.g. <SHIFT>H (for "h"alf).

[xnview]

I often need to rotate an image at 180 degrees (e.g.
after having scanned a document with a flatbedscanner).

It would be nice (and easy to implement) to include
a 180 degree rotate icon on the toolbar and/or a key shortcut (e.g. <SHIFT>H (for "h"alf).

You have the 90° button, so 2 clicks