How can I 'hide' the 'page action' button...
Rick's Smarty code was close, but if it contains non-smarty curly brackets you need to surround it all in {literal} tags as in the examples under the pref, e.g.
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{if $page eq 'Homepage'}{literal} .wikiactions {display:none} {/literal}{/if}
Or you can use plain Custom CSS (safer ;) and target just one page by using it's html.id, like this:
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#page_3804 .wikiactions {display:none}
(this is the id of the HomePage here)
;){kind=link}
;){kind=link}