how to create custom shortcuts for scrot interactive mode

I want to add command scrot -s as custom shortcuts via gnome-control-center keyboard. The accelerator key was Super+S.

but it didn't works.

If i remove -s or try other interactive command like xkill, they works fine.

Also, scrot -e 'mv $f ~/Pictures/scrot/' is works fine too.

So my question, why scrot -s didn't work and how can i fix it.

My distro is fedora 21, gnome version is 3.14.2, and scrot version 0.8

[UPDATE] gnome-screenshot -a is failed too.