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First, here's a world and embark with some of your requirements met..
Humans, Dwarves, Goblin neighbors (Elves absolutely refuse to spawn in this world, for whatever reason I can't figure out)
Magma is ~10Z from the canyon-river bottom. Bottom of the river is Z98, magma forges can be built on Z88.
Sand, Clay, Fire Clay, Untamed Wilds.
Unfortunately, the worldgen entry is too large to post here (The message exceeds the maximum allowed length) so I'll put it on pastebin and link it.
As always, you can randomize the history/name/creature seeds if you want to try for different neighbors/civs.Second, some more details about attempting to put a volcano in the path of a very large river canyon..Spoiler: Nevrast-River-Canyon (click to show/hide)
If I set one world tile to volcanism 100, and set the number of volcanoes to 1, it completely changes the entire world for river flow. It's actually pretty amazing how much that single change causes.
Even so, I tried a few different methods that I could think of to force it, and I have never seen it run the river on the same world tile as the volcano. It will run them adjacent, but never together.
The worldgen engine is willing to reroute every water feature / water flow in the entire 65x65 world to avoid doing that, so.. if it's possible, it's not possible using any method I have come up with or seen before. Doesn't mean it's not possible, though.
EDIT:
Mind you, I'm assuming the reason you don't have humans or elves is because they were created but later went extinct during worldgen. If they weren't created in the first place, you'll need to increase the total number of civilizations to include at least one of each; five is the bare minimum, since the game will aim for at least one civ of each type before creating duplicates. That won't affect anything as long as you don't touch the "Use Seed" or "Seed" values, though. Strictly speaking, you can also get rid of the NAME_SEED and CREATURE_SEED (or just set both and HISTORY_SEED to random using Dwarf Fortress' internal settings screens instead of playing with the text file) if you want to mix those things up as well, also. There are apparently some really finicky changes that may also affect geography that are listed on the Wiki here, so if you have the geography the way you like it, I don't recommend playing with any of the geography settings further. That is, unless it's for !!SCIENCE!!. :3
! Even with a very short world history (like 10 years), so i'm pretty sure that they don't extinct, they are just not generated ... Any clue ?
