Thank you for the input!

When marking targets, are the companion's behaviors affected? Do target markers have any actual significance? Example: If I mark a target with a gold star, because I want it CC'd, is the companion programmed to avoid it, or burn it, or is it not affected?

Has anyone noticed whether or not, marking a target affects companion behavior? Do the marks have any actual significance? Example: If I put a Yellow Star on a mob I want CC'd, does my companion react the the Yellow Star as 'burn it down', or will it see it as 'stay away from this mob'? Is there a preprogrammed response to the marks?

^^ This. Read this guide. It'll help you tremendously. It's not long-winded and has lots of helpful info.

The R2-DB guide has been a great insight. It has some really good info.

R2-DB.com has a good thread on this. It says that your ammo regen rate is determined by how much ammo you have. It's about .8 per second when your ammo is between 8-12, and drops to about .6 per second between 4-8 ammo, then .3 per second when less than 4. Keeping your ammo regen up is a good thing, so it recommends alternating your ammo using abilities with a Hammer Shot, to keep your regen at max, or near max.