This mod allows you to change what blocks are able to be broken and collected with a SilkTouch tool.
By default, it makes SilkTouch tools work on monster spawners, (though they will not keep their monster type) but the configuration is very flexible, and can be used to make any type of block drop a stack of any other type of block if you so desire.
It is fairly simple, and I intend to keep it fairly simple. Feature requests for anything beyond the described functionality of this plugin will likely be denied. (But file bugs about anything that you see wrong!)
Note: This means that it is not getting permissions support.