I have been able to modify the "page-header.inc" in order to add the home icon into the top nav by modifying the following code (I am aware that I will have to change this at with every Photoblogger update):
Ah, I see - when there's a logo the home icon is skipped. That code part came from Tiger, which always has the top menu next to the logo - so it would be a duplicate function there. In Photoblogger I see the point in having both when the menu is placed elsewhere. I will add this inclusion.