Macro Modifiers?

Is there any way to use a modifier for a macro in this game?
For example it would show one icon and use that skill, when I held shift it would show another icon and use that skill.
It would look something like this:
/macroicon "Full Thrust"
/ac "Full Thrust"
/macroicon [mod:shift] "Chaos Thrust"
/ac [mod:shift] "Chaos Thrust"

I know it's not the same but maybe this works?

Code:

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/micon "Full Thrust"
/ac "Full Thrust"
/hotbar set "Chaos Thrust" DRG3 DRG3
/ac "Chaos Thrust"
/hotbar set "Full Thrust" DRG3 DRG3

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Edit:
O wait this won't work .. you can't switch Macros with hotbar set.. you would have to use hotbar copy for that :/