Pressure plates, with a special block under it, can only be activated by special entitiys / items.
If the block under the pressure plate is not specialized for an entity / item, every entity / item can activate the pressure plate

You can use CustomPlate, to make your house more save.
- Just place a CustomPlate in front of your door, which can only be activated by players or even just yourself.
- Zombies, Creepers (other Players) and so one have no chance!
You can also use it, for specail redstone circuit.
- Just create a CustomPlate, which can only be activated by a thrown EXP-Bottle or a falling block.
- Use it as Payment: Detect diamonts to activate a dispenser or a door.

Download the CustomPlate.jar.
Move the CustomPlate.jar in your plugins folder.
Start your server.
If you would like to edit the blocks:
- Stop your server again.
- Edit the config.txt of CustomPlate.
- Save it, and restart your server.
Enjoy

In the config, you define, which entity, player or item can use which CustomPlate.

pig: iron_ore
odinoxin: iron_ore
players: iron_block
odinoxin: diamond_block
chrissw-r1: diamond_block
item.emerald: emerald_block

Block under Plate	Can be used by...	Cannot be used by any...
Iron_Ore	Pigs and OdinOxin	item, other players or other entitys
Iron_Block	All players (Including ChrissW-R1 and OdinOxin).	item or other entitys
Diamont_Block	OdinOxin and ChrissW-R1	items, entitys or other players
Emerald_Block	Emerald (As item)	player, entity or other items
Others	All and everything

There are just 2 permissions for CustomPlate:

CustomPlateGraph