When I read fondant/gumpaste mixture, does it mean that you make the fondant alone, and the gumpaste alone, then you mix them together? If I just want to add GumTex to fondant, how can I do it? Does GumTex make Fondant more elastic? I was just trying to model a palm tree, but the leaves were constantly breaking. Would adding GumTex to the fondant help?
Thanks a lot.
If I use fondant for modelling I put tylose in it to make it more elastic.
When I do flowers I always use gumpaste as it will roll out thiner than fondant and is easier to work with, but that's a debatable point.
1/2 fondant and 1/2 gumpaste is often used for modelling figures as it give you a longer trying time, so you can fiddle more.
I don't think there is an exact science to this, from what I've seen, but you do develop a sense for it!
For instance-
I made hibiscus flowers out of store-bought gumpaste. The petals were very thin, but dried very hard- they've taken quite a beating and haven't broken yet! But I had to work quickly- the pure gumpaste dried very fast and would have cracked if I tried to mess with it while it was drying.
I made a loop bow with store-bought fondant. I added a bit of gumtex to it so I could roll it out thin-as-a-ribbon, and so it would dry pretty sturdily, but also wanted to be able to manage the form as it dried. But I only added a tsp of gumtex to a large qty of fondant (had to keep adding fondant to the batch to get the right color) and forgot to add more gumtex. A few of the loops broke as I was trying to assemble the bow, so now I must try to match the color with another batch. Grr...
Live-and-learn and always have extra on hand! 
Gum paste itself is edible.
If you add artificial stamens, wires, toothpicks, or dusts that are inedible (like silver or gold highlighter dust), you render the decoration inedible. If you put a gum paste deco on spaghetti or a sucker stick (and it has no other artificial or inedible parts), it remains edible.
Rae
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