The D-pad on the Nokia tablets are configured as arrows too, but a lot of users reconfigure up/down to be page up/page down. Much more convenient for paging through documents or web pages. Actually, what users prefer is to have them configured as up/down or page up/page down on an application-by-application basis. PalmOS is quite intelligent that way - it switches from line-by-line to page-by-page depending on what you just tried to do.
I'm pretty sure any game you play will allow you to switch the WASD for the dpad. Is there any game you know of that doesn't allow for remapping?
Quite a few, I'm sure. Most really old dos games, platformers mostly: Keen series for example, I don't think allows you to change the keys.
Fortunately, these all use standard the arrow keys anyway. If not, DosBox can be used to remap the keys to what it does use. If DosBox can't, then the keyboard driver can.