I've tested this before, but I can't seem to get it to work again.
I've got a Doc library with webpart pages. Create a new page and in SPD add a CustomListForm to a custom list in display mode. I change the parameter from Querystring ID to Querystring MyID for ListItemID. But it does not work. Displays nothing. Place the page under the list folder and it works great, but only with ID query string. Am I missing a step here. Do I need something else to be able t use a custom query string? I'm only doing this as ID= is giving other problems with some items not displaying.
Alternatively, Also wondering, if I must have my list forms under the list folder, is there any way to lock down/secure custom folders and pages under a list folder that I create? Say I've got users that can write to a list, but I don't want them running a specific custom page under the List folder. How can I do that.