Special signs now disappear when testing a map in creation mode (and they come back when leaving test mode, fortunately).
Added "pressure plates as special blocks" option in configuration.yml: if enabled, pressure plates will be used to detect players on special blocks instead of constantly checking their location when they move. Consequently, this option improves performance when there are many players. It can be disabled in some specific maps using the new "/cp noplates" command.
Improved special sign regeneration when editing maps.