I already know how to use the syntax in estimating the SVAR/SVEC model in the Gretl. However, I couldn't found how to get the table for the forecast error variance decomposition. 

Moreover, can the set identification be used in the SVEC model too? 

I also humbly suggest that in the future that the VAR/VEC model is designed to support other forms of IRF & FEVD such as the generalized version.

Thanks with best regards

Timmy.