XF 1.4 no attachment thumbnails for guests and posts per page

Arno Nühm

Active member
1. Is it possible to disable attachments by usergroup (e.g. for unregistered guests) completely, also thumbnails?

2. Are users able to change the posts per page threadview? I set it to 20 posts per page, but maybe someone would like to have e.g. 40 posts per page. Possible?