
In my example, you'll see where I envisioned the new buttons go to open add a new color(s) or (billboard(s) to the already established effect. How I imagine it works, is that if you want a range of colors for the effect to cycle through before it reaches its final one, you can keep adding colors to the stack. In this theory, a rainbow effect can be achieved. In the extra billboard(s) case, the software calculates each billboards spawning based on how many you have added. If you have two, they spawn 50/50. If you have 3, roughly 33/33/33, if you have four 25/25/25/25 and so on. This makes it so effects can have multiple stages (if given that extra programming) or even greater randomization.
It was just an idea I had today while messing around in the effects.