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Do you agree that the subjunctive mood is only used in the following ways?

A. Present subjunctive.
-1. All verb forms are the same as for the present tense except in the third person singular. There, use the infinitive (without to).

-I/you/we/they launch the shuttle. (present indicative)
-He launches the shuttle. (present indicative)
-He insisted that I/you/he/we/they launch the shuttle. (present subjunctive)
-The ghost is real. (present indicative)
-If the ghost be real, Hamlet must act. (present subjunctive with infinitive be)

-2. The present subjunctive is used almost solely in noun clauses after verbs of asking, ordering, urging, insisting, etc., and also after adjectives of similar meaning. ---Paul Roberts, Understanding Grammar

B. Past subjunctive.
-1. Only forms of the verb be are affected. Were is used as a linking verb or auxiliary.

-He played the piano. (past indicative)
-He acted as if he played the piano. (past subjuctive; same form)
-He was talented. (past indicative)
-If I/you/he/we/they were talented, what a wonderful world this would be. (past subjunctive with were)

-2. The past subjunctive is mainly used in contrary-to-fact situations, most often in subordinate clauses introduced by if, as if, though, or as though.

C. The past perfect subjunctive is identical to the past perfect indicative.

-If she had driven faster, she would have made it.

D. The future subjunctive, present perfect subjunctive, and future perfect subjunctive are too notionally complex to use. ???
Comments  
Just to add an example to [A. Present subjunctive]

Let the ghost be real, ....

(Can I say "Let the ghost were real, Hamlet had to act....?)
As a post scriptum:

I remember being edited my sentence (1) We argue that this feature is to be considered crucial.

as (2) We argue that this feature be considered crucial.

(1) is a bad sentence? Or there is stylistic preference? Please give me your hand !
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"If the ghost were real, Hamlet had to act." (past subjunctive)
"I remember being edited my sentence (1) We argue that this feature is to be considered crucial.

as (2) We argue that this feature be considered crucial.

(1) is a bad sentence? Or there is stylistic preference? Please give me your hand !"

To my ear, sentence 1 flows better than 2. I think they are both standard English.
Thank you, rvw, for your help. This was one of my longstanding questions ! Roro
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