1. http://db.pandawow.me/?spell=30809 , http://db.pandawow.me/?spell=51470 , http://db.pandawow.me/?spell=2825, http://db.pandawow.me/?spell=113860, etc.
2. On our server all those buffs stack additively.
http://prnt.sc/cjqc2i - 11.29 % haste
http://prnt.sc/cjqc98 - with http://db.pandawow.me/?spell=51470 we have 16.29 % haste, 11.29 + 5 = 16.29 % haste
3. Should stack multiplicatively. So, with my stats we should get: 1.1129 * 1.05 = 1.1685 or 16.85 % haste.
4. Fun
5. 6/10