The commands.cfg has a rotation function with;
Num4 = Rot_left Shift+Num4 [Cmd104]
Num6 = Rot_right Shift+Num6 [Cmd105]
But it doesn't work. Also I thought keys Q and E might do it but no go on that either.
The arrow key only gives 5 degrees rudder but shift arrow is full rudder.
All the defualt key commands (even the ones that don't work) are listed in the
SH5 Quick Start Guide.