Tommy,
I'm not sure what you mean by the Quick List populating. Why do you need it to do that when you can find any aircraft type yo need by typing it in?
To find your B74L, you only need to type B74* into the quick List and it will find all types of B747.
What exactly are you trying to do, there might be another way to get what you need.
For example, if you use Mode S = 43C* then you will show only Brit Mil aircraft in the list.
You can use all the same wildcard filters in MyLog too.