CASE1
So far it looks fine. Let's add extra information:I removed several deprecated unused options.
CASE2
Something unnatural is in selected fragment. Better way to phrase is:I removed several deprecated unused for several years options.
CASE3
Q1. What is wrong with deprecated unused for several years options?I removed several deprecated options unused for several years.
Q2. Is unused an adjective or something else in CASE1/2/3? What is grammatical category of this word in above cases?
Q3. Should CASE3 be rewritten as ...options WHICH ARE unused for several years or like options WHICH HAVE BEEN unused for several years? Can I omit WHICH / THOSE / WHAT, can't they be implicit?