Our idea is that Call Truce isn't _that special_ - it is just like grappling, charge, running or talking - it is something you simply _can do_ if you're at least a bit able with words.
Would there be a big impact of allowing this, and similar feats, be "built-in rules for regular actions" instead? For now I'm not requiring the feat to "call for a truce", but I would like some opinions on the matter.