ok, fair point Fractal_man and Badsville. Thermostat isn't the right word. Enclosure controller then. Obviously lighting and heat are the go. I guess things like humidity with a fogging machine for those with GTP's possibly. Selectable outputs (on/off, pulse or dimmer). Easily replaceable parts like contactors that control the on/off heat control which are often what "stick on". 240vac (for standard incandescent bulbs) and 12-24vdc (for led's) output for the lights including a "dimming control" to simulate sunrise and sunset.. I suppose i've thought about this more than anyone else.
Also, interesting this got moved to chit chat. I would have thought, at least DIY but what do i know.