This is how I macro highly repetitive combo chains to 1-4 on the left hand with minimal DPS loss and no modifier key acrobatics. Thought I'd share - Easy to do for DRK and WAR too, but requires mashing.

You need 2 spare hotbars, one for the Riot chain and one for the Savage Chain. Set them up something like what you see in here:



(I use hotbars 6 and 7 in this example). Note that Spirits and Shield Swipe are completely optional.

Macros:

Fast Blade
/macroicon "Fast Blade"
/ac Shield Swipe <t>
/ac Spirits Within <t>
/hotbar change 1
Riot Blade
/micon Riot Blade
/ac Spirits Within<t>
/ac Shield Swipe <t>
/hotbar change 6
<wait.10>
/hotbar change 1

Savage Blade
/micon Savage Blade
/ac Spirits Within<t>
/ac Shield Swipe <t>
/hotbar change 7
<wait.10>
/hotbar change 1
Please note that Fast Blade on bar 1 is NOT a macro.

In this case, I'd mash 1-2-3 for RA combo (most often used), 1-2-4 for Goring, and 1-3-2 for Rage of Halone. Hitting 1 midway through any combo chain will reset the entire thing to default in case you mess up. If you have a rapid fire setting for your keyboard, you can do this in one touch (but you probably should be mashing for queueing dps anyway).