If I try to resize a window on Ubuntu Studio 14.10, I have to carefully position the mouse over an area of 1px so that I can click and move the borders. This is very difficult to do. Please increase the width of this area (at least on the right side of the border, where it will not interfere with the scrollbar).
Use anothertheme, the border width is determined by the theme.
There is no way to increase the actiaon area using input shape because the compositor in xfwm4 is optional.
What about marking this one as duplicate of https://bugzilla.xfce.org/show_bug.cgi?id=11808