Yes you can post from tapatalk, at least you used to. The forums under went a major reformat recently and its possible support for it may have been lost. I do not use this app personally so I can not speak much to its use.
The mouse is primarily for steering because it is the most efficient way of controling the camera angle or the direction your character is facing. The actual movement is typically still done through keybinds. Granted you could experiment with keybinding strafing to your extra mouse buttons, its really a matter of training yourself to use whatever keybindings you decide on. You can define these keybinds in your keybinding menu. Many tanks however will use the keyboard keybinds for movement other than the quick turning of the mouse.
The only debuff filter the base UI supports is filtering based on what you can dispel. Any advanced filtering would need to be done with an addon. However there is no generic filter that for things you care about and things you don't. You need to define such a distinction on a per debuff basis. Bottom line is you need to learn what debuffs mobs apply and which ones concern you so you can identify them quickly and react appropriately. Many times when a boss applies a debuff it's a matter of you want to get rid of that debuff as quickly as possible which may involve tank swaping as the debuff (stacks) fall off or some other mechanic which allows the debuff to expire. There are other cases when the debuff is actually something you want because some debuffs apply positive effects (the nature of a debuff is simply that you don't have the option of simply turning it off, the effect could be positive or negative). Your problem with debuffs however isn't related to their filtering but how they are displayed. You want a different display format so you can determine this information easier such as a custom buff monitor where you can place debuffs in the middle of your screen.
"In anything, if you want to go from just a beginner to a pro, you need a montage." /w TankSpot WTB Montage for Raiders.