Send fluidsynth commands (needed for breath mode)

Hello everybody,
I'm having an issue using my EWI controller (AKAI EWI Solo) with Qsynth. When I play and hold a note, the volume is extremely quiet. But as soon as I change to a different note, the sound suddenly becomes much louder.

After some searching, I found that the problem is related to how Breath Control (CC2) is interpreted. When using Fluidsynth directly from the command line, the following command completely solves the issue:

setbreathmode 0 1 1 1

With this setting, the EWI responds correctly and the volume stays consistent between notes.

My question is:

Is there a way to apply the same setbreathmode configuration in Qsynth?
Either through the Qsynth UI or by editing a configuration file?

Any help or suggestions would be greatly appreciated!

Regards
Giuliano