I think adding an Assistant Squad Leader is a good idea specially for people who want to roll SL for first time but doesn't know what to do.
1) The people who want to roll SL for the first time but doesn't know what to do can roll assistant SL and learn the SL function by helping him on commanding a squad and slowly learning.
2) The squads will be more organised in combat and in planning flanks, there will be new fresh ideas.
3) The squad specialist or the smartgunner will keep their role after the SL death, unless the assistant SL doesn't know what to do.
4) More people will roll SL after learning the basics when playing assistant SL.
Now, do you support this idea or no?