Global Luametafun settings

Hi,

what's the recommended way to make global changes to metapost commands 
which use the new luametafun interface?

Below is a simple example with lmt_text with the method I use for my own 
command.

\starttext

\startMPcode
draw lmt_text [ text = "Dummy" ];
\stopMPcode

\startMPcalculation
setparameters "text" [ color = "red" ];
\stopMPcalculation

\startMPcode
draw lmt_text [ text = "Dummy" ];
\stopMPcode

\stoptext

Wolfgang

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