Multi sowing a module

Have you tried sowing several seeds in each module? I don't mean sowing seeds of the same variety but seeds of different varieties that would compliment each other in their growing spot. For example you might sow a lettuce, spring onion and parsley in the same module or beetroot, chives and rocket.  If they all germinate, they're planted out together. If only two germinate, its still good. 
If they're seeds that crop at different times its a bonus. 
What do you think? Plan or No Plan?