As a philosophical ideal, miniquests that are converted to quests would give quest points.
We're constrained by a limitation in how the adventurer's log web module interfaces with the state of quests. The adventurer's log gets told at the time you complete a quest what quests you've completed and what quest points that quest has, so the adventurer's log (now RuneMetrics) can display your quest points. Therefore if we change the quest points on a quest after release, the adventurer's log of players who've already completed that quest will get out of sync.
The 60ish miniquests we have weren't given quest points when we added them to the quest list for a similar reason, as their unlisted content was already live and therefore players may or may not have completed them. (Players can be in various states of having completed or not completed those miniquests, so the event that tells the adventurer's log how many quest points it has might or might not have already been sen...
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