The rule for wielding basic weapons in one hand seems a bit lenient to me, considering how cheap and available the "extra grip" modification is.
It also seems to render the hand flamer obsolete, since the penalty to BS has no effect on flame weapons.
I feel like there should be a limit on how heavy a weapon you can wield one handed based on your SB or something.
As a side note:
The entry for extra grip lists the weight modification as x1/3, implying that it somehow reduces the weapon's weight to a third. I assume this is either a mistake or I'm reading it wrong.