The current controls already maintain the temperature within a safe range. Selecting "Auto (Low/High)" or "Auto (Off/Low/High)" will allow the DNS-325 to self regulate the temperature.
The temperature range may be safe, but not necessarily comfortable. Auto(low/high) means the fan is constantly on, which keeps things cooler but is noisy and pulls more dust through the system. Auto(off/low/high) is quieter and cleaner, but not as cool as I prefer.
I would like to leave my DNS-325 on 24/7 but also keep it 'as cool as possible without being annoying' in my one room apartment. I like the idea of the Auto(off/low/high) setting for this, but I would prefer to have the 'low' & 'high' settings kick in sooner than they do currently.
Cooler electronics last longer, and I want my hard drives (and NAS) to last as long as possible without keeping me awake at night!
General - User selectable fan temperature set-points for 'low' and 'high' as with the overheat (system temperature threshold) setting. Even pull-down lists would be good!