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And only a minority of dialects keep that morpheme. As I already showcased, my dialect of Swedish has pretty much infinitives ending in every phoneme except /h/

They follow another rule, namely that verbs with monosyllabic stems ending in a vowel take -Ø in the infinitive cf. tro, gå, se, bli, fly, etc.

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Not for derived verbs, though. The noun spö yields spöa, not spö.

Also, no, not all present tense forms end in -r; vet, kan, skall, vill, et cetera... Also, present tense subjunctive forms, that are thus still present, usually take -e.

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‹› · Ḿḿ Ńń Ĺĺ Śś Źź Ąą Ǫǫ Ųų Æ̨æ̨ Ǽǽ Œ̨œ̨ Œ́œ́ Ɣɣ Y̋y̋ Įį Şş Z̧z̧ θ
Āā Ēē Īī Ōō Ūū ↗ Ṭṭ C̣c̣ Łł Ḍḍ Ṣṣ Ẓẓ Ṇṇ Ŋŋ e˞ o˞ ʷ ʲ ʰ ə

How many people still use present tense subjunctive except maybe vore and hade?

Does it matter? The handful of ones that are in common use still count. No matter how you wish to analyse them mood-wise, they're still present tense forms ending in -e rather than -r.

I do know people who like to use subjunctives of any verbs if it works out, though, but this is of course out of personal choice (one of them writes lots of poems, for example, and has gotten the practice from there) and not by native instinct to do so. It's sad.

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‹› · Ḿḿ Ńń Ĺĺ Śś Źź Ąą Ǫǫ Ųų Æ̨æ̨ Ǽǽ Œ̨œ̨ Œ́œ́ Ɣɣ Y̋y̋ Įį Şş Z̧z̧ θ
Āā Ēē Īī Ōō Ūū ↗ Ṭṭ C̣c̣ Łł Ḍḍ Ṣṣ Ẓẓ Ṇṇ Ŋŋ e˞ o˞ ʷ ʲ ʰ ə

How is the Swedish sunjunctive formed?
They don't teach is in Finnish schools.
Apparently with -e?

I suppose you can say that the rule for weak verbs is usually for the present to take the infinitive root and for the past tense to be the same as in the indicative. For strong verbs, the past tense takes the supine root and replaces the suffix with -e.

So the subjunctive present of weak verbs such as hoppa and bränna are hoppe and bränne in analogy with their infinitives. These have the same subjunctive past as the indicative past.

However, the subjunctive past of a strong verb such as finna becomes funne, in analogy with the supine funnit (suffix -it). The present subjunctive is just finne, though, with the infinitive root, just like for the weak verbs.

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‹› · Ḿḿ Ńń Ĺĺ Śś Źź Ąą Ǫǫ Ųų Æ̨æ̨ Ǽǽ Œ̨œ̨ Œ́œ́ Ɣɣ Y̋y̋ Įį Şş Z̧z̧ θ
Āā Ēē Īī Ōō Ūū ↗ Ṭṭ C̣c̣ Łł Ḍḍ Ṣṣ Ẓẓ Ṇṇ Ŋŋ e˞ o˞ ʷ ʲ ʰ ə