There are a lot of people here much smarter than I am about buttons and control schema, however if you are considering your power budget as an important factor, I just wouldn’t worry about it. While PixelBlaze do get warm, and leaving the Wi-Fi on is a factor, because you say that you will have 600 LEDs involved the total power draw of the PixelBlaze with Wi-Fi enabled is a rounding error on your overall power budget.
Check my post here for more on battery power management — Beginners Guide to Making a LED Festival Coat — I would only consider the WiFi turning off tricks if you’re thinking more like 50 LEDs or less, not 600+, unless you expect a vast majority of them to be turned off at any given time.