There's quite a bit of info here at WCP on rudders - if the forum search function doesn't deliver, you can use Google search, adding site:westcoastpaddler.com to your search string.Where in the arrangement would a bungee be placed?
This thread shows how I made a simple change to a Seaward rudder setup, changing the location of the shock cord and putting a plastic bead in the line.
You can order the Clamcleat (which Seaward had installed) online at sailing supply places like The Chandlery in Ottawa.
If you decide later that you don't want to use the cleat, the holes you drilled can be sealed with small SS machine screws - not a big deal IMO.
It's still possible to break a rudder if you run backwards into something, but having a spring (SmartTrack rudder) or shock cord in the system helps to keep the blade in the water (vertical!) and allows you to cruise over kelp without having to manually pull the blade down again.
BTW, if you do change the rudder deploy line(s) consider making the deck safety line and the rudder line different colours. Swimmers seem to grab rudder lines often during rescue practice.
A lot of factory rigging is IMO just a starting point for the boat owner.
You'll notice that the Seaward kayak in that thread didn't have deck safety line(s) at the stern.