List of Possible Poker Improvements
1) Enlarge the Call/Raise/Fold buttons
2) Relocate these buttons
3) Enlarge the Pre-turn call - check - check/fold buttons
4) Add an all-in button
5) Add option to change table + carpet + chair colour scheme? this sounds silly, but a bit of change from time to time would be nice.
6) Not sure if logistically possible, but, instead of the static avatar images, we could see the actual in game avatar.
7) Unregister button for tournaments
8) When raising, allow players to manually type in how much to raise.

Several of these are already in the game, and several others will be added in v1.0.5 with a huge update to poker.
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Thanks for the feedback, we'll definitely be looking at getting some o these in our next round of poker improvements! As a side note, a few of these are actually already available. There is already an all-in button when you click the bet/raise button. There is an unregister button for scheduled tournaments that is available up to 30 minutes before the tournament starts. You can manually enter any bet or raise by typing into the text box that appears when pressing bet/raise.