Well the topic speaks for its self I find that Dual Pistols are fun but the main problem is theirs little to no Utility same with dual Daggers for thief I would recommend to add them making dual weapons more useful and more fun also more useful for all types of play from pvp/solo/pve as of right now dual weapons seems to do well in pvp and solo only but not recommended for pve dungeons and raiding.
I hope the Devs will take it to consideration and plan to add on future patches.
If anymore wants to add to the problem with dual weapons for thief your welcome to add.