There isn't a "bracket single" option? From memory (camera at home) the options are single shot, continuous advance (fast or slow), bulb, remote triggered and a variety of bracketing options which will take either three or five shots, at different exposure compensation values. If you select one of the bracket options it will only take all the shots (3 or 5) if you keep the shutter depressed until it finishes, else it will stop when the shutter is released.
A good APS-C replacement for the kit lens is the Sony ZA 16-80. At least I like it. Others like the Tamron 17-50/2.8, haven't tried that one.
There is a "Sony alpha users" topic in Talk eqpuiment which more people are likely to see.