Add filter to activity $main_nav default_subnav_slug

[giannis4]

The default_subnav_slug ('just-me') of the main activity navigation is hardcoded in class-bp-activity-component.php (line 249).

A filter would be great.

[imath]

Thanks for your feedback.

You can already edit this navigation adding an action to bp_activty_setup_nav, I believe it's customizable enough this way.