[TYPO3] Override TS for a specific page (meta refresh)

[Pierre Rossel]

"Dmitry Dulepov" wrote
> Hi!
>
> Pierre Rossel wrote:
>> Is there a way to override the TS constant RefreshDelay in that page ?
>
> Make an extension template for that page. See in Web>Template.

Yes, of course. But editors of the web site don't have access to templates. 
I would like a way for them to be able to change this value themselves. I 
guess I have to write an extension that add a custom field to page header ?