Keep in mind that this game is based on Dungeons and Dragons, so altering abilities of classes or subclasses would probably make a bunch of people (including myself) unhappy.
Some of your suggestions are things you can do in DnD, they just require higher levels or subclasses and feats that we don't have during early access. Some things are possible with different classes than you suggested (or multiclassing) and other suggestions sound a bit too powerful.
