Adding an Extra Variable for Time (widget)

Hi

Just started to use the free version of this plugin with my BBPRESS forum.

So far enjoying the option, but one option I would like to request is that on some forums, there is the option to show visitors and members who have visited in the last 15 minutes

Can this option be added to the widget so we can set how long after a member has left there name still remains visible in the widget.

Currently, as soon as a member leaves, the widget removes there members name etc. and I feel it is good for others browsing the forum to know whom has been there recently ?

Thanks.