Hmm, not bad idea
But personally, i would add more types of build:
00:00 Nightly build: BETA
06:00 Dawny build: Stable + Signed jars + Javadoc + Source Jar
12:00 Noony build: Reserved for Future uses
18:00 Dusky build: Classic Build without Source Jar in Gzip Format
??:?? Critical build Stable/Beta: like dusky/nightly, activated by a custom svn tag in comments like "[CRIT]" and "[CRIT:BETA]"
Purposes:
Nightly Build: Out of Box Beta build - this would increase beta testers and we'll have lesser "i can't compile beta" or "where's high five server" topics
Dawny Build: A Certified Build which contains all the things needed to developers, plus certified jars
Dusky Build: A lightweight dawny build
Critical Build: A build called by developers in case of critical bugs/exploits, when executed it deletes stable or beta builds