If you don't already know (and are wondering how some people play so quickly as your turn ends). you can now set up preplay in your settings. It allows you to pick the order of cards that you will need to play (though it will break the chain to confirm discards/trashes/exiles etc)
The only real problem comes in when you have a preplay set, and then they play a card that requires a reaction (pick a card for contraband, don't reveal 1 from your hand for archer, pick a card for warchest etc) and if you have a preplay card already picked it will reveal that instead. It leads to a lot of undos, and then people griping
(like I had a duchess set to play and then the guy revealed war chest but it instead blocked them from gaining a duchess on their war chest, like i'd ban duchess when there are 4-5 cost cards on the board
then they get mad when i ban upgrade (the fairly obvious ban since it was t5) since that was the card they had already picked as soon as duchess was banned. I told him if he really cared i'd pick a diff card and he still rage quit.
A simple confirmation a la the discard/trash/exile function would eliminate this.
all in all preplay is awesome though, just needs a lil tweak.