if devs ever implement weapon model selection (something like saber hilts), then it would make sense to be able to chose between all the DC rifle/carabine variants
an option to use DC-15A model for CR3 would be cool too
you're wrong
kung-fu wasn't removed from soldier
all you need is close combat lvl1 and equip melee
you run at increased speed while in melee, you can perform all standard kungfu moves
edit: it should be okay though if they added quick getup for melee