G'day mate, thanks for the questions! Let's see...
1) Lock Picking adds +2 to your Stealth rolls when attempting to pick a lock. If you have a set of Lock Picks, you may add a further +1. This is due to the fact that some other items such as tiny sticks, hair pins, thin daggers etc can be used to pick locks as well.
2) That was an oversight of my part. It is supposed to be 5 minutes, as you ruled.
3) Hmm. Let me explain the one question bit. What is supposed to mean is that the caster may ask one the subject to do one thing, and the subject will do it. That thing might last 30 seconds or 24 hours, but the victim will do it. They can still be ordered to attack friends and will do so until the task is complete. The Difficulty is 13; Dryads are just able to cast it a little better
4) I deliberately changed the description in the Player's COmpanion so that it could be cast on any statue, funnily enough. The Difficulty of 16 to create the golem, which doesn't have massive stats, I think is a good trade off. However, feel free to use which ever one you wish. You are the GM after all

After reading it and talking to one of my players who is prone to abusing rules, I would advise only allowing a player to control one golem at a time however.
5) That is a fine house rule. However, why do you see this as a problem?
6) Good ruling. I agree. I would also rule the same for Summon Angel and Summon Demon.
7) This was one that I deliberately left vague. The spell is mainly going to be used in combat, so the 'area' is the area where the combat is taking place. It will thus affect everyone involved in the current combat. If cast is a city or somewhere like that, have it affect everyone in sight.
Hope this clears some stuff up. I will give you another one that I personally want to clarify, and this is a bit of official errata.

Levitation spell. One of my players abused this spell immensely during our last game, actually using it as a weapon, for which the spell wasn't intended to be. Therefore, the spell may now only be used on a willing creature rather than just any creature.
V, it would be good to include some of these questions and answers in the QUERP Gamesmasters Companion. If you or your players come up with any more, send them in!