I don't know if this has been suggested or is coming in 1.5 but I was thinking, since I have a 16GB USB, I have a lot of apps. Because of this, whenever I load PortableApps it takes a long time to load all of the apps. If there was a cache it would probably take a lot less time. Of course there would be a refresh option and an option to turn off the cache completely.
see mod r34 PaTChed---if "load apps from DB" selected u have to refresh to load a just-installed app