Sticks to the board and the pin is normal -- it just means you need to flour the board and the pin really heavily.
However, the too crumbly says to me that it's too dry.
In this case, I'd be really, really tempted to add a little -- start with a teaspoon -- melted butter instead of milk. Take a 1/4 cup of dough, say, add melted butter, work it, and see if it improves.
gingerbread dough IS sticky; it's bound to be sticky because of the molasses, and you use vast amounts of flour. The crumbly is the only bad problem.
no subject
However, the too crumbly says to me that it's too dry.
In this case, I'd be really, really tempted to add a little -- start with a teaspoon -- melted butter instead of milk. Take a 1/4 cup of dough, say, add melted butter, work it, and see if it improves.
gingerbread dough IS sticky; it's bound to be sticky because of the molasses, and you use vast amounts of flour. The crumbly is the only bad problem.