Personally I prefer my Sprint on the actual crossbar. I don't need to be accidentally hitting R3 and using sprint on a melee job and destroying my TP bar. I use the #99 macro for things that already need to be placed with the right stick such as Shadowflare (SMN/SCH), Shukuchi (NIN), Freeze (BLM), Flaming Arrow (BRD) or quick-response abilities like Elusive Jump (DRG). You can place all of those abilities in one macro (one ability per job) and it will only activate whichever your job is capable of using. Works very well for me.
