BuddyPress

Is there any way to change where the “Courseware” menu item links to? In my case, I need it to go straight to the assignments page.

I’m willing to hack it, I just need to know where.

Sure,
try this:

function cw_hack() {
    global $bp;
    var_dump( $bp->bp_options_nav[$bp->groups->current_group->slug][$bp->courseware->slug] );
}
add_action( 'courseware_group_set_nav', 'cw_hack' );