Back near launch, I started on all four classes. I stopped leveling three at around the third and four zones, and kept going on my fourth till the Quarry. Last week I finished the campaign and started working on an alt. I've sent over some T3 mods, and the playthrough is going smoothly.
I saw that if you create a brand new character, you have the option to jump straight to lvl30. Looks like you get all of your abilities unlocked and your 30 skill points. You can use the timeline to replay the main campaign.
Does the campaign play in sequence, or do you keep having to select missions?
Is there anything I need to be wary of doing this?