Are there any merits to using a smaller and or possibly less verbose keyboard on mobile devices in certain scenarios?
I was thinking possibly changing keyboards for logins or other areas where you might only have a small subset of characters.
I know there is extensive research about the smallest sized touch buttons (Apple , Google, Motorola , Microsoft all have guides on this) , but what I am asking is what about putting say p/o on the same button or using the keyboards of the 9 button phones on screen.
Are there any instances where it would be wise to show a non traditional keyboard on the screen? (I am aware of the split keyboards but I am talking phones, and novel layouts of the keys / eliminating certain things.)