Related to suggestion "Make hud invisible and only shown when we move the mouse over a player".
Related to suggestion "Leave the hud transparent and make it appear with a clik"
Poker Tracker implements this.
Ideally, make both the normal and hovered opacity configurable so I can decide if I want the opacity to increase or decrease (ie be able to choose between opaque all the time with hiding on hover vs translucent all the time, becoming solid on hover).
This would be an elegant way to implement the related suggestions whilst fitting neatly with the capabilities PCp already has.