FFXIV absolutely has buffering, so even if you press a button and the skill doesn't go off immediately, it will as soon as it can. Maybe just slow down your button presses so you aren't pressign6 things at once. You have a whole 2 and a half seconds to press 3 buttons, just relax. If you are having issues with buffering, learn which skills have longer locks than others. For example, weaving potions take too long for a double weave, so you aren't gonna get something else in without clipping.
Also, FFXIV has this thing where macros don't buffer and can't be queued. SO if you are doing that, stop using macros.
A timer isn't really needed.