I may have misunderstood your post, but basically if you are asking if you can make one button with all your spells in it, and the game will just cast them as they come up......then no, what you're asking is not possible. If it were, everyone would just play with one button.

What you have seen is how boxers basically approximate things, with the /castsequence <somespell>,,,,,,,,,<somespell>,,,,,,,

etc etc, and the use of click macros and other such things.

As you noticed, while you can put some things into macros, and their triggering will not end the macro (using trinkets, etc), most macros will stop once they have encountered:

a spell/something they cannot do
a spell/something they CAN do

People have come up with some great tricks on the board using click and castsequences with gaps and such, so look around and you'll find a lot of great things, and tons of macros approaching the optimal, but what you're asking for (the superbutton) is not a possibility.