A few questions

[Warren Nagourney]

Hello,

I am using OmniGraffle to draw apparatus diagrams (I'm a physicist at 
the UW) and am finding it a nice native replacement for Ashlar Vellum, 
which I have used previously (Vellum is not native yet and is hideously 
expensive anyway). One of the things I would like is to draw a circular 
arc and haven't found any of doing so. I suppose I could enter an arc as 
a text item (shapes.graffleshapes) using the existing ones as a guide. I 
thought there might be a slightly easier way of doing this.

Are there any ways of setting global preferences for default behaviors? 
For example, I usually don't use shadows on my shapes and would like to 
avoid clicking on the box every time.

I assume there is no way to cut a section of a shape out? In Vellum 
there is a stiletto tool to do this; I think it is called "trimming".

The "rotate" tool is very fast and nice, but is there any way to set the 
pivot point?

Finally, I wasn't able to get certain fonts to work. Often one uses 
Greek letters in text items and even though the Symbol font appeared in 
the palette, I couldn't use it for some reason (it would always switch 
back to Helvitica when I tried).

Thanks.

Warren Nagourney