Hmm, I
do understand what you are saying, and I'm quite well aware that kodi has two "timeout" settings, a "shutdown timer" and a "shutdown when idle for x minutes" timer.
However, I think Rob wrote this add-on in response to a thread here ->
http://forum.kodi.tv/showthread.php?tid=259451
I myself have converted and edited the script linked to in that thread and have it successfully running on 3 kodi instances ( all linux based).
I don't want to get into an argument about which method is better, but I would presume that Robs solution is cross-platform, whereas the solution I am currently using is pretty much linux based (although I think it could probably be persuaded to work with Windoze too !).
One button on a remote to increment the timer is very wife friendly which is always a major plus in our family.
As I said in Robs release thread, I haven't actually played with the add-on yet (as I have a solution which is working well and fulfils my needs) but I will certainly be installing it and testing it to see if it gives me extra functionality and/or a better experience.
Whether this is better than the built in shutdown/suspend/hibernate timer I'm currently not sure. Certainly the solution I currently have is (from my point of view). I have also had an add-on which popped up a query as to whether or not kodi should 'stay awake' after a certain time delay. That did work, but the "one button shutdown time" appealed to me.
As a note, if you feel you should ask as to what feature list the add-on has over the built in stuff, you should ask. Doesn't make you a jerk, makes you understand a little better. No-one learns anythig without asking !!!
Hope you get your solution