Here are my thoughts:
1.) When you use any kind of pace kit besides John's, you're not using the original roms. John's kit is the only one that still uses the roms, but cleverly injects the data for the high-score table when it is called. Every other kit just had a hacked rom hiding on the highscore save kit. These kits are allowed, so modified roms are clearly not the issue here. The issue is whether or not the GAMEPLAY changes.
2.) The pace variant on John's kit does not modify the game play. I'm sure he would be happy to verify this for anybody who is curious or unsure, but this is a fact. A bit of text for "highscore" is changed to pace, with the calculated pace under it, and then the "how high can you get" screen has pace information. This does not change the game play at all, and it is simply doing a math calculation internally and showing it on the screen.
All of that being said, the Pauline hack is simply a graphical variant on DK and does not change gameplay either. So my frame of logic is not very sound as graphical hacks should be accepted under that guideline. All of that being said, I am voting yes but I feel the line does need to be drawn at hacks that:
a.) Do not modify the gameplay itself in any way, and
b.) Do not modify the graphics in the core gameplay (elements that the player controls) in any way.
I'm curious to hear other's thoughts on this.