MetaPost integration: default parameters

[Oliver Buerschaper <oliver.buerschaper@mpq.mpg.de>]

Hi,

ConTeXt already passes quite a few length parameters on to embedded  
MetaPost code ... BodyFontSize, CurrentWidth etc.

Would it be possible to add some more font/math related parameters to  
the default definitions? I'm thinking of exposing math OpenType  
parameters like

AxisHeight
FractionRuleThickness
UpperLimitBaselineRiseMin
UpperLimitGapMin
LowerLimitGapMin
LowerLimitBaselineDropMin
etc.

of the surrounding text to MetaPost as well. This would be very handy  
for me since I need to draw diagrammatic expressions to be used in  
formulas and I'd like them to adapt to the current math font and  
fontsize automatically. At the moment I set these variables manually...

Also, is there a way to directly get the glyph outlines of, say, $ 
\bigotimes$ in MetaPost code and use it to derive some length unit  
from it?

Oliver
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