Hold the shift key when placing objects to place more then one at a time.
Shift key is the key for everything now.
If it don't appear to work.
press shift and the command or action you where looking for.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit