Version:           0.2 (using 4.2.00 (KDE 4.2.0), 4.2.0-1.fc10 Fedora)
Compiler:          gcc
OS:                Linux (i686) release 2.6.27.9-163.fc10.i686

Sometimes it happens that you click on the wrong line: this is due to lines not being really thick. Moreover if you are the sixth human player you are more prone to errors (the contrast between white and grey lines is not that much).

A good idea to avoid unwanted swearings (like when you assign a kiriki to a large straight) could be an option to undo the latest choice. This really doesn't hurt the game (as you cannot reroll the dices, you can just change you choice).