You can technically already do that, though you have to use a macro. Of course you'd need to put it on a hotbar to actually use it, but it's better than nothing! I personally use the following:
/micon "Soul of the x" item
/gearset change x
/title set "x"
Just replace the x on each line with the job name, gearset number and title name.
/micon "Soul of the Dragoon" item
/gearset change 11
/title set "The Azure Dragoon"