Zach Wegner and I made great progress on back-porting WinBoard 4.3.14 to Linux. We now have a version that compiles with the new back-end files, and thus basically supports all features of WinBoard 4.3.14 that are not directly related to the human interface.
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: