Regarding this wiki-style page...how to realize ?
I'll contribute, but I'd prefer to have all donations flowing to those who risked their hw and shared their knowledge with us in order to motivate such people for the next time we might need them. Writing a guide is no work/value in comparison.
I think it was tolip_wen and temen, in case I forgot one please forgive me and stand up.
To have a custom script executed at boot time, you need to modify/rebuild the firmware (I'm going to do so for myself these days as soon as I'm done I'll post it in here how to do it)
Regarding your 3h question, a simple cron job or some kind of loop with sleeps would do the trick in general.
Well, I and others have been running their machines with the same risks as everyone else and have tested and contributed to the best of their knowledge/capabilities.
Also, I don't think the value of a comprehensive, exact guide should be devalued at all. Compiling knowledge, findings, and techniques into a centralized, valuable, and exact resource is just as useful as any other contribution, if not more so. This isn't about the act of writing, it's about someone acting as an expert editor of a knowledgebase. That's pretty significant stuff.