So, you can get a pet in the lobby, but you can then bring it to parkour to troll. If you're in 1.9 or 10, they can block you and knock you off. Or, you can get a magmacube and bring it. It makes it super big. This can also be bad, because it will blind you of what block's in front of you, and also has a bigger chance of knocking you off as seen in the screenshot. Thanks.
100% Support I don't know of this, but a lot of players, especially new ones, might not know how to do it. It may be easier to just add a disable pets option (if that's not already thing) or just have them despawn when the player jumps off the start.
That's only part of the suggestion. People are abusing it, and blocking the way for other people which is annoying.
If you guys will start recording people and show that they are purposefully blocking the way, or preventing you from coming through, yes Ill punish for trolling. If I see a ton of reports regarding this, I'll do my best to get them removed from parkour. But I need to see that its a big issue before I push for them to be removed.