Thanks McKynzee for following up.
The watering intervals are short because the purpose of the misting/propgation beds are for rooting soft or semi-soft wood cuttings. When taking cuttings from plants when soft, the leaves that remain need to remain moist but not soaking wet to avoid transpiration. The short intervals of 5-10 seconds on and off for 5-10 minutes allows for just enough moisture to remain on the leaves while they root without drying out.
Generally these beds have a quick draining medium like sharp sand to prevent too much water from being introduced to the cuttings and preventing rot. The moisture from a couple seconds of spray every few minutes is plenty for rooting.
My thought on how to implement this kind of functionality would be having it as a subset of the "fixed interval" schedule and that when going through the setup of "fixed interval" and "mister" is chosen, that the option for cyclical timing is a "choice". By enabling that cyclical timing then the user can choose "how long on" and "how long off" as an option and seconds are allowed. This way it wont clutter up the rest of the functionality and allow only people who are interested in plant propagation the option, which is a very large community and potential venture for Rachio to advertise the product functionality as such.
I currently grow fig trees, over 80 plants (~60 different varieties) and rooting over 100 cuttings this spring, possibly over 200 by end of season. I also plan to venture into Mulberries/Blackberries and other fruiting plants. If its worthwhile i might eventually have a side business, its a fun hobby.
PS - if you haven't realized by now, i work in the product software industry. My job entails product features/functionality/road mapping/