Custom default and/or title field settings

Currently there are two ways that Imagefield can handle alt and title tags:

- they can be left to their default setting (alt uses the file name of the image, and title is left blank)

- they can be set manually (you type whatever you want the alt and title settings to be)

But what if you want the alt to be something other than the file name of the image, but you want the alt to be static? I.e., if you want the alt tag for a node to always be "webcomic". If there were a way to specify, when adding an imagefield to a cck content type, that the alt and/or title had a customized but constant value, and to set what that constant value was, it would allow you to avoid typing in the same information every time the imagefield is used...