Question to Rw in the strain-only parametrization

[opinner]

In the function shearstrain(), one finds the code snippet

# Strain only parameterization
# Use assumed shear/strain ratio of 3
Rw = 3
eps_st[iwin] = eps_strain(eps0, Nm, N0, Sst, Sstgm, Rw, f)
krho_st[iwin] = diffusivity(eps_st[iwin], Nm, Gam=Gam0)

Inside eps_strain(), the function aspect_ratio_correction_st(Rw) is called, which evaluates to $1$ for Rw = 3, making the whole function superfluous. But observations point to possible higher values of $R_\omega = 7\pm3$ (Kunze et al., 2006 [p.1560]).
This value changes aspect_ratio_correction_st(Rw = 7) = 2.69. Currently, I manually multiply the end result for the dissipation rate with this factor, to change my $R_\omega$ value.

Would it be possible to make Rw_strain = 3 an optional argument of the shearstrain() function? Or does that only clutter the argument list, as a workaround is possible?