I had a problem. In my case, max capacity for the rooms is 2 adults and 1 children. The default price shown was for 2 adults and 1 children
But since most rooms are sold for 2 adults only, the default price is too high.
If I removed the children from room capacity, kids could not be added during next reservation stage.
So what I did, was to remove the children. Now in the Rates, the default price is 2 adults 0 children. I changed all prices but kept the children variations. After this, I re added the children to room capacity.
And there you go. Room capacity shows 2 adults 1 children and the default price is for 2 adults. During reservation, you can add extra kid.
It would be nice if you could keep this situation in mid for future versions of the plugin.