first question
atm this is not implemented, only thing you could do is run normal amule one time, and make it static, afterwards select in prefs "connect to static servers only", but like I said with amuleweb this does not work yet
2nd question
thre is a huge thread about kad disconnection in this forum, read it
firewalled means you have not opend all needed ports for kad, remeber you also need two udp ports
3rd question
add the line of folders you want to share to
/home/USER_NAME/.aMule/shareddir.dat
pay attention, its case sensive