Jelly Bean questions

I just got my Galaxy Nexus and I was wondering if there is a way to disable vibration on the lockscreen, this annoys me quite a bit. Also, is there a way to remove the useless Google search bar from the top? Is it a widget or something? I really do not understand why it's there if there is a built in add-able Google search widget. Last thing- does stock JB support deleting homescreens? I only use two and it just is a slight nit pick. I know these all seem like insignificant things but they do add up. Thanks!