I had a good look at the quagga link you sent, and this looks very comprehensive. If i get some time i would like to experiment with a test box. This gives an enterprise range of routing tools - however it also requires an enterprise skill level to administer it, and I believe is beyond what we require with the size of network we currently have. Ask me again when we have grown in size to have branches all over the UK and I'll have changed my mind.
My forum post was aimed significantly lower, at just incorporating an editor for the routes file in the GUI (and the option to re load it!)