currently one needs to set two parameters when using Refluxing with GRHydro only: nvars and nvars_evolved which are set to the same value. The two different parameters allow refluxing to be used with thorns that implement their own timestepping indedpendent of MoL.
To simplify usage in situations where only MoL is used I proposed to introduce a new parameter nvars_not_evolved_with_MoL which defaults to zero and to retire nvars_evolved in favor of the new parameter. This would make MoL based simulations with only a single parameter choice possible. Alternatively we could have a second string non_MoL_refluxing_variables that lists the variables which have refluxing applied to them but are not evolved with MoL.