Passing additional paramaters to nlsList(nlme) fit function

Hello, nls-users,

is it possible to pass additional parameters to the model function that are
known and groupwise constant with nlsList? I could not find something like a
"keep this fixed" option in the documentation and the code (my fault...?)

The current workaround is to break the problem down into groups and use
globals to pass the constant parameters, but it is ugly code and won't work
when an over-all nlme is needed.

Dieter Menne