Are you going to correct the "bugs" that let some players bypass hard areas?
I mean, for example, in devres07.j2l, the castle level of the 1^st Devres pack:

• On each of the lowest platforms on the left and on the right of the big building there's 1 extra life, so if you pick them up and then fall off, in all you earn a life. The worst part is that you can repeat that as many times as you want, so this process could be repeated virtually eternally by some not-so-smart people. Such as me.
• Inside the castle you can activate the save point behind the wall, so that you can skip searching for all of the crates, you just have to die then.
• In the last part you can jump directly on the upper floor if you play with Spaz.

(taken from a previous post of mine)

In my opinion you should take care of glitches similar to those on the first and third ones on this post, because otherwise you reward metagamers than true players (1^st) or players using some specific characters (3^rd). The others reward clever players, so there's usually nothing bad on this.