3- Perhaps you should implement XFMG-like watermark functionality or like the one that used to be here before it was deleted by the author.
au lait submitted a new resource: [xenMade.com] Watermark (STWM2) - Watermark for Images in Posts, RM, MG and others DEMO Watermark for Images - based on group rights - Original images are not changed - Available for Post, Conversation, Resource Manager, Media Gallery and others Read more...
xenforo.com
This will make it a great add-on that provides ease of mind for forum owners to retreat should something go wrong or if they decide to change the watermark image. Glad I tested it on my local machine before putting it up live on my forum.
2- Neither wont make a difference, tested on both.
1-
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Will send you the image via pm