Show only current wiki and subwikis via widget

Hello guys, whats up? I'm setting up a Wiki to serve as guides, like ign does (ign.com/wikis) on my website (criticalhits.com.br/wikis) and on the sidebar, i'd like to show only my current wiki and it's subwikis via widget.

Is there any fast way I can modify the "Display Wiki Pages" to do this?

If not, well, that's a great suggestion for next updates

Thanks a lot