Like Jason says...be prepared to sharpen the blades before, possibly during and for sure afterwards before you do any lumber.
If you do use a router, be prepared to either resharpen it also after use (I use those small DMT diamond hones on mine) or use a used bit that you don't care about.
If I have to joint any man made stuff I use the planer with the fence as far back as it will go so that it doesn't ruin the knives anywhere bar the far end. I can then bring the fence forward slightly when I need to work timber.
I do the same thing if I know I will have need of the jointer before I get around to changing the blades out (I've got 3 sets) or sharpening those in the machine.
Andy,
Your tip will work perfectly as described of course but I guess it depends on your work patterns whether it's suitable for any particular person. A pro cabinet maker friend of mine who (admittedly) has a 20 inch planer, likes to keep the first couple of inches nearest the fence pristine for jointing door edges and the like. So whenever I beg the use of his machine, I am reduced to 18 inches Actually, I think it's the ten feet of infeed/outfeed table that I am most envious of!