Shinsplint the Wanderer's page

i was talking with my wife the other day about products we'd like to see from paizo. the two we'd most like to see are boxed adventure sets. something akin to the beginner's box with all the maps pawns and booklets you need for a full adventure. one of my favorite old adventures was dragon mountain (which i believe actually had something similar to pawns in it) and we'd love to see something like that. i'd easily pay $40-$60 for one, depending on length.
the other thing we'd like to see is one on one challenges. remember the old fighter's challenge, thieve's challenge etc? we'd love to see something like that, an adventure for a dm and a single player. it is often just the two of us and it's hard to scale regular adventures down for a single player.
thoughts?

has there been any official ruling on what the penalty is for the arrow stab from the stabbing shot feat? i've only seen a couple discussions about it, one seemed to think it was a -6 penalty (the -2 from the feat itself plus the -4 for using an improvised weapon). the other school of thought is that the spirit of the feat intends it to only be a -2, assuming that the feat trains you to use the arrow as a dagger-like weapon for this purpose.

anyway, stabbing shot: Benefit: When adjacent to an opponent and making a full-attack action with a longbow or shortbow (including composite bows), you may choose to make a melee attack against that opponent with a drawn arrow rather than firing it. If the attack hits—whether or not it does damage—your target is pushed back 5 feet away from you. You can then fire arrows from your bow normally, at the original target, or at another target within range. This melee attack replaces the extra attack from Rapid Shot, and all of your attack rolls for the round (the melee attack and the ranged attacks) take a –2 penalty. If your initial attack leaves you with no enemies threatening you, you can make the subsequent ranged attack or attacks without provoking attacks of opportunity.

the rogue in the group i dm for purchased a ring of invisibility during our last session and this brought up a few questions that i wasn't sure the answer to. since the ring of invisibility can be activated as many times per day as she wants, does this mean that she can sneak attack every other round, activating the ring one round, dealing sneak attack damage the next?
also, the description of the ring says that it is per the spell. does this only last a set number of rounds, or does it last until the rogue attacks? it seems that if it lasts a set number or rounds, it would depend on the level of the creator of the ring...which, it would seem, would make the price fluctuate.
anyway, if anyone could clarify this for me, i would greatly appreciate it. thanks!