Would it make sense to add the option to include global scalar
parameters to the vectors of variables included in a System?  I'm
thinking right now about a surface ablation rate that ends up coupled
to every element in a system via a moving-mesh model, but I think John
had to workaround our lack of the same feature when doing his arc
length continuation solver.

The trouble would be the dense rows and columns that each new scalar
would add to the sparsity pattern.

This isn't a feature I want to add right now (there's a workaround
that'll do for me in the short term) but just something to think
about.
---
Roy

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