Only first GCD action queues.

[jmccann000]

Example:

/ac "Heat Blast"
/ac "Split Shot"

In this example, Heat Blast will queue when active, however Split Shot will never queue, even when Heat Blast is inactive. Split Shot will cast when Heat Blast is inactive, but it will not be queued so the macro delay exists.

[natis1]

From what I can tell this seems to be the result of a bug? design decision? in the base game. If you use an unavailable GCD action it still adds it to the queue. This mod basically just does every ac in the macro as if a player was hitting every button to cast these actions manually. Doing this manually without any mod or macro yields the same results.