This is a list of all the filters (plugins) I've written for MCEdit. You can download MCEdit here.
This is not an MCEdit filter, but you may need it in order for the PlayerStatues filter to work.
Fill in blocks randomly. You can select the frequency of the block, so if you put in 16 for the frequency 1 in 16 blocks in the selected region will be changed. You can also make the filter only replace certain existing blocks of a specified id. If the replace id is -1, it may replace any block in the selected region.
Select a mob spawner and this will add several random options to its list of spawning alternatives. You'll need to set the spawner properties with the SetSpawnerProperties filter, if that's something you want to do.
Remove veins of ore that are not reachable without tunnelling through stone.
Create a command block structure that will spawn in another structure in your world.
Changes all spawners in the selected region into minecart spawners.
Combines all entities in selection into a single stack, sorting by altitude.