A beta might sound like a good idea, but it's really not.
I remember Brawlbox 0.64 beta by Kryal. It included a feature where you can add new textures, and loads of crap happened. I'll give a few examples:
-Some TEX0 files were accidentally renamed (Menselchar44.tex0 was renamed 22.tex0, and it took me a while to figure out that this was the culprit to common5.pac crashin Brawl O_o)
-Changing texture formats (Ex: I8 to CMPR) crashed Brawlbox
-Some textures were screwed up (One changed from Blue to Red color)
-Files were sometimes saved incorrectly (I couldn't open the PCS file once. I opened the file with HxD, and everything looked like it was randomly typed. It looked something like this:
My point: Brawlbox 0.66 may have a crap load of bugs that may harm the user more than benefit him/her.