I don't get the point?
Unless you want to rework RDM's rotation, which is another topic in its own right.
BLM's triple cast is a utility tool, because movement is much more "dangerous" DPS wise than it is for RDM (or SMN).

A RDM can move quite easily if you know how to use your tools and benefit from them.
Corps à corps and Displacement are straightforward. They come back frequently, you just need to "aim" where you want to land in the case of Displacement.
Dual cast : you can freely move during one GCD. Add a Swiftcast (and slide cast on the first GCD) and you have a fairly comfortable window to move with no DPS loss.
Reprise : the newest addition to RDM, a ranged Weaponskill (so it's instant, you can use it while you run). We don't have final potencies but 300 is quite good for its low Mana cost.
So a slide cast > dualcast >swiftcast > Reprise gives you 3 full GCDs to move (7.5 seconds roughly) while keeping DPS uptime. That's enough to cover any distance I guess.

Although RDM's strength is that you can move once every two GCDs so planning your movements is far easier than any caster.