[Koha] customizing Koha 2.0.0

[Stefanie Mohsennia]

Hello all,

we have installed Koha 2.0.0 at the International Library in 
Düsseldorf/Germany. It's up and running and we are now starting to 
customize the system. I don't know if this is the right place to ask 
questions that are not really technical, but rather geared towards the 
application. If there is a different list for "librarian questions", 
could you please point me in the right direction?

Here are our questions that arose after our first customizing attempts:
1. I configured a membership category and assigned 10 as the fee to pay, 
but when I look at the membership record that has been created for the 
first member in this category, it says "Fee: $30/year". Where does this 
figure come from and how can I change it to the right amount which would 
be 10 EUR?
2. The date when the member joined the library was automatically set to 
27/3/2004, the date when I entered the member's data. Also, the expiry 
date was set automatically to 27/03/2005. How can we change both dates 
to match our present expiry dates of memberships?
3. We would like to allow members to take books out for 28 days and 
allow 2 extend their loan period twice. Is it possible to customize the 
system according to our specification?
4. We have two different loan periods for DVDs and videos. The member 
can either opt for a three day loan or a seven day loan (the latter 
costs more). Is there a way to have this choice for the same item in Koha?

I appreciate your support very much and am looking forward to receiving 
answers to our questions (I'm afraid these won't be our last questions, 
though).

Best wishes from Germany,
Stefanie Mohsennia