I think this is the section of my preferences.xml file that you would care about...
<group id="tools" bounding_box="0" style="fill:none;stroke:black;stroke-opacity:1;stroke-width:1px;stroke-linejoin:miter;stroke-linecap:butt;"> <group id="shapes" style="fill-rule:evenodd;" selcue="1" gradientdrag="1" arcstart="0" arcend="0"> ... <eventcontext id="arc" style="fill:red;" end="0.068538919" start="0.041123352" usecurrent="1" open="0" /> </group>
I think this is the section of my preferences.xml file that you would care about...
<group box="0" "fill:none; stroke: black;stroke- opacity: 1;stroke- width:1px; stroke- linejoin: miter;stroke- linecap: butt;">
style=" fill-rule: evenodd; "
gradientdrag= "1"
style= "fill:red; "
end=" 0.068538919"
start= "0.041123352"
usecurrent= "1"
id="tools"
bounding_
style=
<group
id="shapes"
selcue="1"
arcstart="0"
arcend="0">
...
<eventcontext
id="arc"
open="0" />
</group>