Extended crossbar is EXTREMELY helpful. Even if your bad with memory or scared you will press the wrong button first L>R or R>L... You can set both L>R and R>L to be the same half bar and then it don't matter which you press first. You will have half a hotbar disposable to you at any given time + your 2 cycleable hot bars. I usually put my emergency things in the L+R extended bar so I have no trouble getting to them or missing a cycle que and hitting the wrong skill.