Should std.param be only accessible from the top level script?

[dlespiau]

It may be nice to restricts parameters to the top level to avoid the "glog" effect. Having libraries defines all sorts of parameters without the user having a say in it.

It also has a more functional feel to it: parameters are supplied at the top level and trickle down.

Library could still expose object describing parameters and top level script expose them if it's what the user wants.