This is my first Bukkit plugin.
It can be either downloaded from bukkit or from my website.
You can also follow me on twitter for recent updates.
I was searching for something like this, but I couldn't find anything similar so I decided to make one.
Stronger Piston is primarily intended for elevators (lifts) using pistons and sand (or gravel).
It improves strength of pistons that are faced up (all other directions will work as usual).
Basically removes limit of max 12 (or 15?) blocks that piston can move (again, only up).
Just copy plugin in your plugins directory and (re)start server.
Go to your plugins directory (at bukkit server location), open directory called "Stronger Piston" and modify config.yml file to suit your needs.
You should put ID of blocks which you want to be blocked (prevented) from piston to move.
ID's should be separated by comma (you can put spaces if you wish, it doesn't affect).
Examples:
nonMovableBlocks: 12, 13, 15, 100
nonMovableBlocks:12,13,15,100
Also you can modify max block length (how many block piston can push - 15 by default):
maxBlockLength: 15
