I don't know if I speak for all players, but I find building a pump stack incredibly tedious. I also don't like running a reservoir through a cavern or fiddling with a map until I get a usable volcano. (Also, without a water cavern my fortress ends up dying of thirst) I was thinking that maybe somebody could make a sort of "magma well", or come up with some way to haul magma into a pond using pots, buckets, or cauldrons, perhaps using gloves. Perhaps a less imaginative solution would just be to allow pump stacks to pull liquid up from multiple z levels below.
As is, magma seems like a really neat, interesting feature that nobody can really use without df hack or tons of tedious repetitive build tasks. I know that doesn't really apply to most of the more savvy programmers, but as a player it is kind of like a toy in sandbox your not allowed to play with.
I also don't like hauling things between 100 z levels. "Candy" is waaay at the bottom of the map and trying to get it to your fort is a pain. Some sort of dumbwaiter or elevator would be a nice edition to DF, letting you haul things up and down using a pulley and manning it with a dwarf "puller". I know you can use a drawbridge or hatch to drop things quickly, but that presents a hazard, and it only works for things going down.
Both seem within the technology and scope of the original Dwarf Fortress, and have been used since ancient times. Since a "magma forge" is strictly a fantasy convention, I don't really see the harm in adding an easier way to move magma up to the surface. I know the minecart situation was supposed to address some of these issues, but I personally just find them to be way too complicated, too labor intensive, and too tedious to work with.