A) You write them yourself. With a place with so many different themes, subthemes and all sorts of permutations there's no way we can come up with anything even remotely resembling an adequate listing of powers and abilities. Further, writing your own powers allows them to be tailored to your specific needs as well as incorporating any MUSH-specific requirements.
A) Long story short - it depends. Different kinds of powers have different restrictions, usually depending on how much of an impact they'd have on the MUSH and other players. We usually encourage "simple" damage, for instance, in combat - beating the other guy up, not destroying their minds to turn them into a gibbering retarded wreck. While we sometimes allow powers more of the latter type, remember player characters are a lot stronger than no-name bystanders and can usually repel such powers.
A) Mind control is a biggy - basically anything mind-control related has to be consent-based OOCly, and ICly possible to fend off via sheer willpower. Another one is anything really crippling, i.e. full-body paralysis or sleep spells - usually these need to be possible to fend off as well. Anything truly god-like, worded convolutely or not, usually ends up rejected as well, and truly massively destructive powers are often not good. That said, many times "lesser" versions of these are alright; usually the balancing effect dilutes these to some extent. Soul-related powers are another biggie. Read 'news spiritual' before you even think about anything like this. In general, look at 'news powers' - there's no way we can give a hard and fast answer to this.
It should be noted that time travel itself is virtually impossible to get due to the sheer disruptiveness and twinkiness of such a power making it impractical. Most time travelers get extremely good teleportation powers as a "consolation prize", which can get them between various worlds in various time periods in the Multiverse.
A) This format:
POWER NAME - Short, concise description of the power, including general ideas and weaknesses.
Things to AVOID include long lists of spells, overly flowery language, unneeded data or length, anything that's not concise. We want you to drill down to the point. It's also best to avoid multiple paragraphs - each power should be it's own short, single paragraph, though sometimes multiple paragraphs are appropriate.
A) Magic, tech, psi, etc. are roughly equal. Don't expect having magic (or anything else) to be an instant gurrantee of a win - it isn't, not by a longshot.
A) This depends on a variety of factors. The admin do not say that every theme's world is absolutely positively equal, and some are just more powerful than others. On the other hand, maybe a character was simply evaluated in a different way for whatever reason (sometimes people apply for less power than they could get away with on a particular character).
A) A TP power is a power that's ridiculously strong and usually falls outside the regular power level system. A TP power must have a factor that is out of your character's direct control; that they "just won't use it" is NOT ENOUGH, as that would be crippled by the balancing system.
A) Aura Flare is having a "base" power level that's lower than your coded power level. On occasion (you should NOT be using this in more than a third of your battles and probably less) you can use this to power up to be stronger. For instance, you have a character with a "base" power level of 32 and a "aura flare" to 34, as mentioned in your +powers. The "base" power level should be what you're at most of the time, but the code will let you go up to 34, and you can on occasion.
A) A Power Level is a numerical level of how effective one is, most notably in combat (see - news power levels). This is NOT AN EVALUATION OF HOW DESTRUCTIVE SOMEONE IS - we have characters with 300 foot tall mecha that are outclassed by standard-sized (albiet extremely skilled) humans. This often BUT NOT ALWAYS coincides with someone's prominence/importance is in a series, i.e. Link and Ganon from Zelda would have a relatively high PL, whereas a random Moblin or Octorok would have a very low PL (though it might be possible to get a more powerful one as a 'chief' Moblin or whatnot). The recommended scales for what should get what are in that news file. It should be noted that most people are in the 30+ range. PLs are doled out to specific stats in coded combat, and act as a general effectiveness stat otherwise.