Re: displaying php scripts in center column
Would this appear on just one page of your site, and not on every one? If not on every page, one way is to use an iframe. The php script can be called as the page source for the iframe. This way there is no Tiki restriction on the script. You can get an iframe wikiplugin here
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As I recall, there is a "Group" wikiplugin that will only display content to specified groups. This plugin could surround the iframe in your page.
I haven't experimented with PHP in Tiki's HTML pages for a while so am not sure what's possible now.
-- Gary