I was just looking auround wondering "Hmm where did my post go ? Did it get deleted ? Did I say something rude ?" haha, no more fun back to work...
You are able to work on a seperate store, without using WMI by using /import and /export. What you can do is /export the current config to a temp file in the VistaBootPRO dir or what not, and then /import the store they want to work on, and then when its done /export that store to whereever it came from and /import back the original file. I am using this technique now with BCDedit and its working fine I can import and export it to my primary (Windows XP SP2 PRO) OS and then load up VistaBootPRO to do some of my editing. I did notice sometimes it complains if a drive like X: is referenced and does not exist so that would have to be changed when editing external BCD stores.
I almost lost my OS atleast twice this morning from BCD issues (Luckily I got my handy WinPE DVD and WinPE External HD, which BTW is the whole reason im getting so crazy with BCD in the first place), I was getting that error about running it as admin but I finalley figured out if u use BCDEdit to /import a store or even a blank environment that dosent exist, then the error goes away, ALSO when getting said, run as admin error and trying to use BCDEdit instead it will also error saying it has been altered externalley and needs to be reloaded or something similar. But /import ing a new file or an old one gives u access again. Maybe its a bug, in BCDEdit NOT VistaBootPRO.