If you could raise the shop signs so ground dwellers can't block it. Or at least removal of the string (if it serves no purpose) above the sign would give greater access.
We have some moron there now, deliberately standing right in front of it.

 

No, because they are still going there to manually sell their crops. Read the suggestion first

 

an extra sign or two would be lovely, some people love blocking others and it is to an extent interrupting other players experience on the server, not extremely, but an extra sign or two won't do any harm either