So you can apply morphing to a shuriken (confusingly) but you can't conclude whether an enhancement is melee only or not based on that table.
Text is what matters. You can apply morphing because the text of morphing says it can be applied to any melee or thrown weapon... the table simply backs that up (if it didn't the text would still trump). You can apply Power Storing and Spell Storing because the text says both can be applied to any weapon. The table in MiC backs up both of those, while the table in DMG does not back up Spell Storing on ranged (but again, text trumps, and the table is just for randomly found stuff anyway).
MIC continues the only on the melee list trend for spell storing, and does not otherwise instruct on it that I can see.
This is false. MiC does not continue any "only on melee list trend for spell storing" as it lists spell storing as something that can be applied to any weapon on page 285 (though that's in a table, which is still trumped by the DMG text... which agrees with it of course). Of course, it also says something else... as you note in a moment. But only in tables.
And the table in the MIC, which is not for random generation?
Is still a table. Text trumps table. The text says Spell Storing goes on a weapon. Especially when we've got two tables, one of which lists spell storing and one which does not, trying to claim tables trump text just isn't going to work.
I disagree that the absence of a superscript on a table is definitive raw (especially when you're dismissing it as merely a random generation table and then appealing to it), though I think absence or inclusion on the table which is the list of ranged weapon enhancements (not random generation, just a summary list, MIC p. 242) is definitive.
You can't just decide arbitrarily which rules you want to follow and which you don't... there are specific rules for what to follow and what not to when rules contradict. Text trumps table, so the text in the DMG trumps outright. Furthermore, the Primary Source for magic items is in fact the DMG, so it trumps again. What we have here is text in the primary source saying Spell Storing works on all weapons, a table in the primary source that says Spell Storing is only randomly found on melee weapons, a table in MiC saying Spell Storing is an enchantment for melee weapons, and a table in MiC saying Spell Storing is randomly found on any weapon. One of those, by the rules, trumps all others (twice over, for being both text and primary source).
JaronK