Bukkit

Currently, if a long generation process is halted, it will resume from scratch, checking each and every chunk that was already generated.  I would like to have the option of resuming a previously canceled generation at a certain percentage.

Going hand-in-hand with this is the option to create regions in reverse order.  Say, if you were doing the same large area, and you're not sure where it was halted, but you want to get it done in a minimal amount of time without repeating the same steps first.

Right now we need a better way to detect if chunks exist without trying to load them. Bukkit doesn't (or didn't, I haven't been keeping up with recent changes) have an API for this, and 1.4 will supposedly have a new API that will require substantial changes anyway.

When I do updates for 1.4 I'll see if I can make this situation better.