Finally the new GemRB version 0.6.5 released on July 2011 is now available for Oneiric and of course other Ubuntu versions such as Natty,Maverick and Lucid.
The release notes states the following:
two new config options (off by default):
UseSoftKeyboard: Toggle use of software keyboard on devices that support one. It pops up when text input is required
TouchScrollAreas: Toggles a wider and visible gutter around the screen for scrolling the game area. Intended for devices with a touch interface.
You can find the package as always on my ppa.
More details see http://www.gemrb.org.