Any idea if it' possible to remove items from the Creative Mode list and disallow the placing of them? I also want to stop people from breaking the bottom layer of bedrock.
No, but an easy way to do this would just be to ban items from being placed, using a plugin such as WorldGuard (http://forums.bukkit.org/threads/se...dvanced-fast-area-protect-blacklist-1185.790/) would be a good solution. Note: You need to have WorldEdit (http://forums.bukkit.org/threads/edit-sec-admn-worldedit-5-0-world-editing-de-griefing-1-0-1-r1.62/) installed on your server in order to use WorldGuard. As for breaking the bottom layer of bedrock - WorldGuard is your friend. You can build-protect the bottom layer.
Creative instabreak can be bypassed and many plugins do so. I recall you can easily disallow block placement and there is a boolean for if the player is creative, so.... (off the top of my head code incoming) Code: public void onBlockPlace(BlockPlaceEvent event) { if(event.isCancelled()) return; else if(!player.hasCreative) return; else { //Code to get config for blocked items here if(/* Code to grab blocked item */ == event.getBlock()) { event.setCancelled(true); } } }