Caeth, you should be able to put a stamina hard cap in for tanks - it looks like we bugged it for BrM's in a recent update. If you look at a
blood DK for example, click 'edit stat weights.' Do you see the box to add a hard cap? That's what it will look like when we fix it for BrM. Sorry about that!
Ragethorn: Mr. Robot lets you upgrade your items now

If you click on an item in your list, it opens the gear selection. At the top, you can click the up arrow to upgrade your gear.
Here's some more info.