I too find the thumb breaks on BB's useless and remove them. Re-holserting I suppose could be considered a draw back but to me the is a CC system. Re-holstering 1 handed in a smooth easy manor rates about zero compared to concealability, comfort, and access.
The draw does require some practice. With my PM-9 I've learned to hook my thumb over the rear sight to extact the gun and then drop my thumb into a proper grip/firing position as soon as my stong hand and weak hand meet.
It's not quick draw slick and I'm certain some of the Tacti-Cool Mall Ninja's may object but it works for me.
Good luck, now you can buy a box or two of practice ammo with extra money.