How can there be multiple outputs with same address in the same transaction?
It definitely seems weird to have two outputs towards the same address, but if it was picked up by your bitcoind node, then miners will probably accept it, because they're also using bitcoind.

It would be interesting to read the raw scripts of the outputs. Most likely, as you say, it was created by someone using the raw commands.

One scenario that I could think for someone doing this is that you'd want the receiver to claim the outputs in separate transactions. If there was a single 0.3 output, the receiver would need to claim all 0.3 to use them. 

However, I'm not sure when this would be useful.