here you can find an up to date and extensive list of module parameters that can be applied in some modules.

content_type_guid

tikipage

wiki pages.

tikibook

wiki books that contain a hierarchially structured list of wiki pages.

tikicomment

comments found troughout bitweaver

tikiuser

user information - also used to access users homepages.

fisheyegallery

image galleries created by fisheye

fisheyimage

image uploaded using the fisheye gallery

tikiblogpost

posts made to a blog.

other values

boolean

This means that the value is either true or false. in the case of bitweaver, setting these values to anything will set them true.

numeric

Any parameter that takes a numeric value, obviously expects a number.