You cannot bind multiple gcd weaponskills actions to the same key with a macro without using /wait, but you can do it for ogcd skills by ignoring the wait command and turning off error messages in your options, they will fire off as fast as if they were seperated but you just have to hit the button more than once to trigger multiple skills. I keep Internal Release and Blood for Blood on the same key with this macro. It is very helpful if you play with a controller and want to save hotbar space.

/macroicon "Blood for Blood"
/ac "Internal Release"
/ac "Blood for Blood"