-addtag= Add a tag to your coinbase
-txindex Maintain a full transaction index (default: 0)
What do those two do? I'm guessing the tag is meant for miners? Is it useful for regular people who just run a node or wallet?
Since I just run QT like normal, I don't get the full transaction index? Does that take up additional space or isn't everything in the blockchain anyway? Or I am correct to guess that this is better used by large online wallets or something?
Heh, oops, -addtag is a custom mod that I maintain. It does indeed add tags to the coinbase for mining.
-txindex makes the node keep an index of all transactions. This is very helpful for RPC services, particularly those using raw transactions.