Cannot Create Single Barline at an end of Staff Key Signature Change

My System:
-Ubuntu 10.04
-Musescore 1

The bug: when a cautionary (end of staff) key signature is created, it is created with a double bar line. This is inconsistent with the behavior of regular key signatures. Also, it is impossible to change this bar line to a single bar line, and doing so can cause a formatting shift which sometimes pushes the key signature off of the staff lines.

To reproduce:
1. Create a piano score in the key of A major (3 sharps)
2. Create a line break
3. Create a Key Signature change at the end of the last bar of the first system to three flats. This creates a cautionary key signature. With normal key signatures, the default is to leave a single bar line, but on a cautionary (end of staff) key signature, it creates a double bar line. This is one part of the bug.
4. Drag a single bar line over to change this. One would expect that the bar line would become a single bar line, but it remains a double bar line and sometimes messes up the formatting, for example, some of the key cautionary key signature may go beyond the staff lines. This is the other part of the bug.

A workaround: none is needed if you want double bar lines at your key signature changes, but if you don't, you can put a line break a measure before or after the key signature changes thus guaranteeing that the key change will not occur over a line break.

Thanks for all your work on Musescore,
-Isaac