Nice find Ebony. I gave it a try with this

Code:
/click DominosActionButton10
/click DominosActionButton11
/click DominosActionButton12

/castsequence [@party1] reset=3 Riptide,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

/castsequence [@player] reset=3 0,0,0,0,0,0,0,0,0,0,0,0,Riptide,0,0,0,0,0,0,0,0,0,0,0,0,0

/cast [@party1target] Lightning Bolt
and I was able to successfully get Riptides rolling between different toons with LBs in between. When I get time I might try to migrate some of my current sequences back to clicks.

Here's the old threads for reference, but please keep discussion in this thread instead of rezzing the old ones -

Utilizing /click to run concurrent castsequences
/Click Macro Compendium