When they introduced Trust they explicitly said that it will be for one character and the rest TRUST NPCs. However, if you haven't been paying attentions to the announcement the English describtion is misleading. It is very clear at the german Translation as well as the original one (as far as I know). So the blame is putting with the translator - if at all.

And yeah, Gula pointed already, that it was explained why it wouldn't be possible to change this anytime now. However, you can always request this to be changed and if enough people support this, chances are, that SE at least looks into this.