That's the one, thanks Kasper!Admin Commands Toolbox is what I believe you are thinking of.
http://www.curse.com/mc-mods/minecraft/221584-admin-commands-toolbox
Thanks Frank, that's a big pity but good to know - you don't know if there is anyway to retrogen them?I have found that it will not generate the ae2 meteors, thaumcraft nodes, etc.
The ACT mod will generate the general terrain and ores and such. Structures, Nodes, Meteors, etc will be generated upon the chunks first load, mobius stated as much in the instructions. It was done that way to keep the generation time as low as possible and not tax the computer/server too much.I have found that it will not generate the ae2 meteors, thaumcraft nodes, etc.
+ Fixed a couple crashes due to some possible generation problems. If one occurs, the chunk will be decorated only when someone comes close to it (those are really unfrequent).