The worst category to supervise on wiki answers is the technology category because of the accuracy of the answers expected.
Yes, you can Supervise more than one category.
Sadly, no, you cannot. Another Supervisor might want to supervise that same category, so no 'rain checks' are allowed for categories. However, when you are old enough, you can co-supervise a category with another category supervisor for that same category you wanted to supervise.
There are often multiple supervisors for a given category so that is not a problem.
You can go to browse categories and click on which one you would like to supervise, then click "supervise this category" which will appear on the right side of the page.
Yes, you need to e-mail them and also you probably need to join the SPA program here on WikiAnswers, which is run by Stupid Little Genius (Link to her profile page in the Related Links section). You also should be familiar with the category you want to supervise.
Tricky one to answer. Supervisors don't supervise a set number of contributors - they supervise individual categories. For example - I supervise the Snakes category. Some categories will be more popular than others - and thus attract more contributors.
Yes and no. Questions on WikiAnswers are answered by members of the WikiAnswers Community. There are not people sitting in an office answering the questions asked. However, there are many professionals who answer questions on WikiAnswers. Many of the supervisors are professionals in the category they supervise. So you are very liekly to get a good professional answer to your question.
When you are being evaluated as a supervisor for a particular category the categories of the questions you have answered typically do not play a factor. Instead, the quality of the answers is what is important.
No answers can be added to the WikiAnswers Local category.
The supervisors for the 'Questions about WikiAnswers' category are Kamuna and Dino10.
"WikiAnswers Local" is a placeholder category for questions about certain countries. No new questions should be added to the main "WikiAnswers Local" category.
Sometimes. If there are already enough supervisors in a given category, you may be able to supervise a sub-category or another category. There are also "floating" supervisors, who are generalists that have basically the same powers as category supervisors, but just help out wherever they're needed.