Usability: Visual style name length

[skiwi]

I wanted to create a visual style for a diagam element.
Once I found the Format Tool toolbar I was able to proceed.

I have the following feedback

[*]the maximum style name is 12 characters, it should be much longer than this
[*]there is no "Rename style" menu item
[*]it is too easy to change the default style
[*]there appears to be no means of editing a style once it is created
[*]from the menu item Element | Appearance the option 'apply style' should be available
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