Hi, that's a tough one, If you google for Gtk2 Webkit mouse position you get some links to C code ( which you could probably easily convert to Perl), especially WebKitHitTestResult.

As far as being able to programmably move the mouse position to an arbitrary point in a window, I've not seen it done, your best bet would be to ask this question on the gtk-perl-maillist.

You might have more success using keys, like tabbing to advance focus to the next clickable link.

If you find an answer, be sure to post it. :-)