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I'm playing a lvl 5 Vanguard but right now my Character is a Brain in a Jar. I decided to run with it instead of making anew character and now my Goal is to make a new body. I don't think there is any obvious rules for that so I'd like to get some oppinions on what might be a fair way to decide the capabilities for my new body.

The Weaponmaster's Combat Guide gives options for creating custom weapons but it doesn't list anything regarding misfire values for firearms.
Does this mean that you can not make Firearms using this guide or am I missing something?

Benefit: You can take a full-attack action, activating abundant step or casting dimension door as a swift action. If you do, you can teleport up to twice your speed (up to the maximum distance allowed by the spell or ability), dividing this teleportation into increments you use before your first attack, between each attack, and after your last attack. You must teleport at least 5 feet each time you teleport.

I'm making a magus that takes advantage of this feat. My Question is wether or not I can teleport or even partially teleport another player while I am executing this attack.

I read this as a modification of the Dimension Door spell. Fro me two possibilities applied.
1. Unlike me an ally without this feat cannot teleport along with me during the increments. He could at most appear at the final target location of the spell.
2. Since each teleport works as dimension door I can take along another creature and maybe even drop them off after a certain teleport.

Fluff wise 2. is the only one that makes sense to me. RAW it's unclear.
I tried to find an answer on the net but couldn't find a single post discussing this problem.