Yeas, the developer notes will strip out any occurrence of the word admin, it will assume the admin directory is the PowerCMS one. You will either need to manually ad admin to the path, or move the PowerCMS files outside of the admin directory, if you go this rout, you will need to update the root url in the wa_settings table.
for the second issue, see the following post for a fix:
showpost.php?p=54402&postcount=7