Steve, you're right, baroque-style bows have a curved stick, like a.... bow, in a D shape. But the hair is still straight, so I'm not sure I understand how the shape of the stick would allow a person to strike all four strings at once. Bridges are curved, putting the strings in an arc, and hair is flat - maybe there is something I am missing in the geometry. The best I can do is 3 strings at once.

Anyway, as regards chords, play what you feel and forget about the rest. UNLESS the person who wrote the song is also playing with you, and says otherwise! ;-) You'll know what sounds right and what doesn't.