elnelson, as far as single login you're looking at something that can be complex depending on the other CMS you are using, which CMS is it?
I have dabbled a little in the research for single login and I wish to do the same, but I am going to have to get a developer involved, it's over my head, and it will cost a little money too.
As far as friendly urls,
Go to Control panel/SEF URL under the "Activate Feature" heading check mark the box "Search engine friendly URL"
If you are using Apache, you'll need to go to the root directory of your Tiki installation and rename _htaccess to .htaccess as well. Take away the underscore and add the dot.
Hope this helps.