Summary;
Simply attempting to change the layout from official to anything else is not possible; any deviation is immediately reset upon launching the affected titles. This issue is not yet present in other Source/GoldSrc titles.
I believe the issue is caused by whatever special version(s) of the Steam Controller API which have been assigned to HL / HL2.
Steps for reproducing this issue:
Change or modify the official controller template for Half-Life 1/2 to literally anything else
Immediately have your template overridden back to official
2.5. Your own template is now labelled as 'incompatible' (despite still working fine with every other Source/GoldSrc title)
Realize you have no choice but to to press Y to reload
Sys;
Summary; Simply attempting to change the layout from official to anything else is not possible; any deviation is immediately reset upon launching the affected titles. This issue is not yet present in other Source/GoldSrc titles. I believe the issue is caused by whatever special version(s) of the Steam Controller API which have been assigned to HL / HL2.
Steps for reproducing this issue: