Magnitude of shocks in Bayesian IRF

Hi, I want to see Bayesian IRFs with 1% increase of shocks.
However, dynare only provides 1 shock.
There might be a trick as 1 p.c. Bayesian IRF Shocks.

I want to know if this works in dynare 4.5.0.

Dynare 4.5 should support the relative_irf-option directly