Okay, I'm done with this. It is fully functional with respect to developing games, but falls short with manipulating Sierra's games because many of their resources are compressed with LZW encoding. I'll probably come back to this tool & add decompression functionality at some point, but in my mind I've met my requirements.
I've tested it with several different games (Conquests of Camelot, Space Quest 3, and I actually started with Cloudee's remake of Black Cauldron). The games seem to work fine after reincorporating the manipulated files into their respective games, but I'd would appreciate some quick testing!!
It's written in Perl & I compiled it into an executable as well. Note that running the .exe it will take a considerable time to actually start up (because it contains the entire Perl interpreter & needs to be extracted into temporary files - from what I understand). I would recommend installing Perl & running it that way for optimal results.
A final word: please check the included source file for a full writeup of how to use it.
Cloudee: if you don't mind, please download the file & mirror it here (Collector as well, if you don't mind).
http://www.mediafire.com/?4c1247oc568o141