I don't care if there are rules about the 0.5 flights, but be consistent about it. Last round we were all told that it was ok to have two 0.5 flights, now it's changed again?
If it's going to be such a problem to have 0.5 flights, then just eliminate the option altogether.
Some flights come in setting their price at $39 just to run out the competition right off the bat and it's easier to send in two 0.5 flights into the same destination to make up the money.