I have reviewed the alpha test package for these patches, and can report that the scripts are designed to safely install and uninstall the modifications when run manually from the Linux command line (which is appropriate for an alpha test with an experienced base of testers).
The scripts replace the Linux kernel and kernel modules, and modify the LunaSysMgr binary in a verifiably straight-forward way. They save the original versions of these things (making sure they don't overwrite them if you run the script twice), and allow you to restore them as long as the device boots to the command line. Even if the device doesn't boot to the command line for some reason, a webOS Doctor will forcibly revert these changes.
Since I don't have access to the source code of the kernel modifications yet, I cannot report on the functionality or efficacy of the patches (and the authors want all such reports to be relayed back to them in the first instance anyway, so I will uphold that commitment).
Whilst I understand that the authors of these modifications may not want to publish the kernel modifications during this alpha testing period, I would assume that the authors are fully prepared to release the kernel modifications under the terms of the kernel GPL license at the appropriate time (i.e. to the public when it is released publicly, and to any of the individual alpha testers if they request it).
I think these two guys are going about this the right way.
An improvement I would suggest for a public release would be to query the most recent reboot reason, and not enable the higher speed if a reboot occurs for an abnormal reason. Alternatively (if that is not possible), to default to a normal speed for boot, and have a user application front-end to modify the speed setting.