Nostalrius Begins - Quality wow vanilla realm (1.12)

I use supermacro addon and made this macro with modifiers:

Code: Select all

/run local s,a,c=IsShiftKeyDown(),IsAltKeyDown(),IsControlKeyDown(); if s then cast("frostbolt(rank 1)") elseif c then cast("remove lesser curse") elseif a then cast("mana shield") else cast("frostbolt") end

macro works fine, but it always shows frostbolt icon even if I press ctrl/shift/alt.
Is there any way to make it work like in newer wow version? For example:
when I press Ctrl macro icon should be changed to "remove lesser curse", Alt - "mana shield".