BTW I never really thought much about this but I think I exclusively
use macros to return complete entities (union, texture, function,...).

In this case it would be something like (untested online code snippet)

#macro Basic_shape (Rpipe, Rsaddle)
function
{
   1 - sqrt(...)
}
#end

#declare f_basic_shape = Basic_shape(0.4,0.4)

isosurface
{
   function { max (f_basic_shape(x,y,z), -f_basic_shape(x,y,z) ) }
   ...
}

Probably avoids a whole lot of trouble ;)

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