For instance, is there a way to nest my "i18n" helper inside another helper's hash variable?
{{view "SearchView" placeholder="{{t 'search.root'}}" ref="search" url="/pages/search" className='home-search' polyfill=true}}
Update: Handlebars now supports subexpressions, so you can just do:
{{view "SearchView" (t 'search.root')}}