1. Currently the only way to move around/scale UI widgets is with the mouse. Make sure the UI lock is turned off. It's the little padlock icon in the micro-menu. Also you can change the windowed mode resolution which should make the UI bigger on your screen. As a person who plays on a 50' TV, I use 1280x720 screen size which is the same as my screen resolution. Yea you sacrifice space on your screen to make the UI bigger, but it's the only way I can read the text sitting far away.

2. Not sure about this one as I've only ever used nvidia gpu. I would suggest making sure your video card meets the recommended specs for this game and make sure the graphic drivers are up to date.

3. These macros will let you equip gear:

/equip head "item name"
/equip body "item name"
/equip hands "item name"
/equip waist "item name"
/equip legs "item name"
/equip feet "item name"

for weapons:

/equip mh "item name"
/equip oh "item name"

mh being Main-hand and oh being off-hand

also for arrows and/or fishing bait and I think throwing weapons go here too:

/equip pack "item name"

There's macros for accessories too but I can't remember exactly how they go atm.

Can go here for any other macros or /commands you want to know.

4. This one you can't do currently, you either turn them all on or off, can't just hide your own. People have requested this though so it's probably in the works.