First of all, congratulations for version 0.09.
Now to the main subject. As I have seen, so far qucs has good support for digital circuitry, RF and simple analog circuits.
The thing is, that just for what I need, which is switched circuits (like Buck/Boost etc...), the engine seems to choke on the circuit.
Could it be that i'm setting the wrong simulation parameters?
Also, coupled sources would be a nice addition.

If there's something needed to be done I am willing to help (or at least try).