Hola Marcos

Yes you can express a feeling or wish about something in the past. Using your examples we'd say:

Nos molesta que nunca estudiaras español/que nunca hayas estudiado español.

Estoy tan contento de que tu novio fuera a Harvard/ haya ido a Harvard.

Ojalá nos hubiéramos conocido antes. 

On the last one with ojalá you can only use the pluperfect subjunctive though. (hubiéramos conocido) 

We do have a few lessons on both the conjugation of past tenses in the subjunctive or uses of them (not only expressing wish and feeling but also uncertainty) You can see some examples here:

Using the Spanish subjunctive to express doubt or uncertainty

Using the Spanish present perfect subjunctive after esperar que to express a completed action in the past

Querer que followed by the imperfect subjunctive in Spanish

Conjugate Spanish regular -ar, -er and -ir verbs in present perfect subjunctive tense in Spanish (El Pretérito Perfecto de Subjuntivo)

Saludos

Inma

Hola Marcos

Thanks for your suggestion. We are considering some wider articles for certain topics. The ones you are mentioning are worth considering of course. We´ll have this in mind.

Saludos cordiales