This does not qualify as "I wish this game were available", but since RPGs came into the conversation, I've been idly wondering about Arena - or, even more so, Daggerfall. But it's an idle thought. It's way outside the scope of ScummVM. Or is it? Considering the stuff that's already in? Precedents are being set.
Personally, and now this is strictly down to personal likes, I dislike crunch-heavy, spend-hours-on-making-character-traits RPGs; I favour either story-heavy or adventure-based RPGs (like, well, Quest for Glory for more adenturey-ones, and Lands of Lore for a story-based dungeon crawl), or roguelikes. I essentially like me some dungeon crawling. It is certainly cool to load up ScummVM and, instead of getting engrossed in a campaign, go for a quick session of a crawl. I used to like Dungeon Hack, which is, strictly speaking, pretty empty and dull - all it offers is the roguelike experience. Which is sometimes what I feel like! I have never played the Eye of the Beholder series, but since ScummVM supports them, I plan on getting them soon and giving them a whirl (I plan on trying to get the Amiga and SegaCD versions somehow if I can - I want that automap!).
All this is to say, if more RPGs were to be added, this is certainly where my interests would like. On one hand, story-heavy, not necessarily multiple-branching paths or anythings; RPGs like the ones that SSI made, crunching ones, are a bit meh for me; and honestly, I tried Ultima often and it never did much for me (but now that it's in ScummVM, I'll give it another go). That'd be what I'd like the most. I think Krondor kinda fits here. On the other end of the spectrum, roguelikes for a quick dungeon-crawl fix. When I say "quick", I mean I don't need a deep narrative other than the emergent one: I don't need to start a game that will span an epic. A hack, a crawl; I feel like one, I load one up, and play against the RNGs.
As a lifelong adventure game fan (I started early, and no other genre ever captured me as much), this is what would get my vote, and what I would love to see in ScummVM wish-wise.
As a completionist, before any of these things came to exist, however, I would prefer to see the current series "completed" (between quote marks because Ultima IX and, I think, Lands of Lore 3 may remain forever out of scope); the other Ultima games, and the other Might and Magic games, and whatnot.
All this talk of RPGs made me think of SSI, which made me think of Veil of Darkness. Now there's an intriguing game that I liked to play back when, even if I couldn't really get far into it for some reason.
RPGMaker games have been mentioned. To be sure, that would mean a whole new dimension to ScummVM. Also a whole new dimension of complexity, as it's another engine - like AGS - that has hundreds (thousands? dunno, probably) of games in varying versions that would need to be in good playable status, and, like AGS, may be a bit of an ongoing eternal battle.
Personally this would not get my vote, partly because I do not wish to go down that rabbit hole and partly because I think it would dillute the focus of the wonderful programmers in the project. But if it were to happen, and/or if there were programmers who really wanted it and would work on it, I would still be very happy about the additions.
The one thing I would love RPG maker support for is... "yay, I'd be able to play Corpse Party!"
EDIT - Funnily, the more I think about
Dungeon Hack, the more I think I'd rather like to play it in ScummVM!
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) I feel the need to point out that, for all the crap, it still gave us GK2; Black Dahlia has a few issues, but it's still, I think, an important title (if far too puzzle-heavy); the Phantasmagoria games were important excursions in the field of computer-game horror. Criticism may be levelled at these - especially, I am aware, Phantasmagoria 1 - but they really were more than visual novels, video quality notwithstanding. 