Premodifiers in English

The order and behaviour of the premodifier (an adjective, or other modifying word that appears before a noun) has long been a puzzle to syntacticians and semanticists. Why can we say ''the actual red ball'', but not ''the red actual ball''? And why, conversely, do some other premodifiers have free variation in sentences; for example we can say both ''German and English speakers'' and ''English and...