Add few features to vBulletin vBForms plugin

I'll use vBforms to create forms to allow users to create a thread after fill all fields: [login to view URL] I need to add the following features to this plugin: 1) Allow to upload attachments, (4 or the number I specify (I can edit the php code if I have to)) 2) Automatically close the threads and allow the user (and mods/admins) to edit it 3) Delete them automatically after 60 days Thank you!