i think you should wait with portableapps. Because:
I do not know how I missed your post! ... ... until now.
I have just posted a new project based on PortableApps.com!
The reason to do this is to split this project, so that PortableApps.com can go away... finished from pe21. What do you think?
I have also removed Opera and FreeCommander as default installs. Replaced by FAR as the only program to be always included.
In splitting this project, I was able to find a lot of untidy junk which was easy to clean from the new project because it is very basic. I think it will be harder to tidy up this pe21 project. Wise man say, 'It is more dangerous to walk down the hill than to climb up it!"
I am now using (occasionally) the winpe.wim from Win7 WAIK. You should have a look. I cannot use the base winpe.wim because unable to install the optional OS packages to the .wim when running pe21 on my XP machine. So I keep one fully-packaged Win7 winpe.wim to use - not sure which packages are actually required.
BTW. I have included your website link on the new project. I now think that I should have asked you in the first place. Is it OK? I may be able to put it on the winbuilder.net server. Let me know what you think. I can 'pull' the new project off. It all hinges (depends) on your PortableAppsMenu Installer. I also included 7-zip and FreeCommander, which do not install, and also Abiword which does silent insstall ... I'm fairly sure...