As the headline says: Give Rapid Reload feat when you've selected a Weapon Focus for either crossbow type.
Would be great
The problem is, crossbows aren't weapons that are quick to reload.
Now, I understand: it's fantasy. "Why can't we have convenience in our fantasy?!" Well, this is just my opinion. I don't think this would be a good thing for EFU.
Just take the feat
It's basically like needing a feat to get your second attack with a greatsword, that would otherwise not require a feat if you had gone with a greataxe.
It's more about bringing it a bit in line with bows in terms of power. At least how I see it.
Plus, you're still also barred from using rapid shot with crossbows.
I like this. The problem with a lot of crossbow suggestions is that they tend to buff one kind of crossbow build and leave others in the dust, but this is a nice little simple thing for all crossbow users.