After long time wonder like you, how to use shortcut same as windows (F6 or Alt+D) to type the path/url. I found your topic then finally found the way to do. It very simple but I haven't known until now. See the attached file
The solution is solved by Dexter_Inside (http://uberplay.org/Documents/oemguide.html). The author make it successful. The reason also why can't use the sources and imagex from Vista to install XP. I followed the instruction and nearly success . Any one try it and post your experience when successful. Waiting....
There's an idea/solution from Dexter_Inside (see here: http://uberplay.org/Documents/oemguide.html). It sound very interesting and simple, the author make it successful then I tried but it never success. So, any one should try and discard more.