Final Fantasy Hacktics

Mr. eternal, I'd like to request, If I may, that both protect and shell's bonus be increased(if possible). in game protect and shell increases about 40% of the weapon defense and magic resistance respectively, and they approximately reduce 25% of the incoming damage.

ability power 40
attacker                          receiver
weapon attack: 300          weapon defense: 250
Magic power   : 480          magic resistance: 360

without protect:
damage= ((300-(250/2))*40)/100
           =70
with protect:
damage=((300-(((250*358)/256)/2))*40)/100
           =50
without shell:
damage=((480-(360/2))*40)/100
          =120
with shell:
damage=((480-(((360*358)/256)/2))*40)/100
          =91

my point is that protect and shell have the same bonus as defense up and m.res up (mighty guard), but they have expiration. increasing their bonus would definitely make them more usable and worth wasting 1 turn. I mean I'd rather nuke up the enemy or just use healing abilities than bulking myself with low bonus. Besides shell and protect don't really last long so giving them a more feelable (I can't seem to come up with the right term) effect won't harm the gaming experience. sorry for my bad English   

may i ask if there's a way to make a mission repeatable?