At the moment, the options can only be controlled through command-line arguments, as the menus of xboard still need to be adapted. I added xboard command-line options for most of the features that I added. This means the adjudication options, time-odds mode, node-count-based timing and all variants can be used under xboard, albeit in a cumbersome way.
We are now preparing the release of version 4.3.14, which will come as a WinBoard executable package, and xboard executable package, and a joint WinBoard/xboard source package.
A screenshot, mailed to me by Zach:
