Hi!
Fatigue is managed by variables in the BASIC.CFG file (found in the /data/cfg folder). This file can be edited with a regular text editor such as WordPad.
You several alternatives for restoration. Here are two of them:
1) If you backed up your game before installing RUb, or if you used the Jonesoft Generic Mod Enabler (JSGME), you can copy the original BASIC.CFG file back to its original location.
2) If you didn't back up BASIC.CFG, you can look up the "UnRealUboat" mod, which has stock versions of the original SH3 files for some components of RUb that some folks don't want. You can download UnRealUboat (as well as JSGME) from
http://u-boot.realsimulation.com in the "SH3 Downloads" section.
If you decide to use JSGME, I suggest you re-install SH3 (and the V1.4 patch) so that the JSGME will start with a clean slate.
Hope this helps!
Pablo