Tunnel Rat feat and Squeezing

[FanaticRat]

http://www.d20pfsrd.com/feats/arg-feats/tunnel-rat-ratfolk

Ok, just to make sure I'm understanding this feat correctly...

1. With this feat, would I not incur any penalties for moving into or attacking a square that was 2.5-5sqft large?

1a. Along that lines, I would only need to make an escape artist check for moving through a square that was 1.25 sqft or less?

2. Do I incur movement penalties when going past squares of medium sized creatures?

3. If a tiny sized creature can inhabit the square of a medium sized creature, would my character be able to inhabit another creature's square? I've gotten mixed responses on this one.

3a. If so, do I take penalties to attacking when in an allies' square?

[Cuup]

Reviving. Link.

With this feat, am I still considered Squeezing at 2.5', but am also allowed to Squeeze at 1.25'? Or am I not considered Squeezing until 1.25', letting me occupy a space of 2.5' without penalty?

[Wonderstell]

Cuup wrote:

Reviving. Link.

With this feat, am I still considered Squeezing at 2.5', but am also allowed to Squeeze at 1.25'? Or am I not considered Squeezing until 1.25', letting me occupy a space of 2.5' without penalty?

Assuming a small creature of 5ft space, you would normally be considered squeezing when entering a space of 2.5 ft (and wider). This feat allows you to treat yourself smaller than you are for the purpose of squeezing.

I can see how you came to the first conclusion with a strict reading of the rules, but it's pretty clear what the feat is intended to do.
Treat your character as one size category smaller and occupy spaces of 2.5' without penalty.