I checked "is cloned by" link but there's nothing about text showing by "/title actionbar" command. Maybe it should be discussed?
I think that text showing by command blocks should be clearly readable. It's various text, not only few predefined sentences.
This could be as non-default, maybe as "/title actionbar withshadow" option.
As of 16w32b shadow should be present because of command block contraptions which can use actionbar now.
Pumpkins and heads can be placed on the ground by right click.