wow, thanks guys but I don't really got all the hype here, it's not an editor or anything really related, it's not easy and handy to use either. Let's hope that osu!LAZER branch release "within the next month"(c) (I'm extremely excited about that) will bring something useful to the editor mode.
Just checking difficulty progression in spreads without much effort is very valuable in Taiko as it's a lot more continous than in std. You will often keep 80% of the lower diff intact and add stuff in the next diff instead of approaching the map anew with a different mindset. Now you can evaluate the diffspread in like 1min when before you had to check all diffs individually and go in and out of diffs to compare stuff and I'm sure the competent Taiko modders can make even more use of that feature than I can think of spontaneously.