I got MAME to play Asteroids in all versions, even though we don't have the same kind of monitors with trails after the vector-graphics it still is the game for me; not really into any other retro game than Asteroids
There is support in standard mame, added awhile back via HLSL. Yeah, check this out:
https://www.youtube.com/watch?v=wroAGOiQLVk&t=130s
https://www.youtube.com/watch?v=lcjY6_F3p_w
Probably the best how-to video: https://www.youtube.com/watch?v=OKv30HpFC-k (includes non-vector games support)
Some feel AAE is still the best solution, I haven't messed with mame in a while so really can't comment but there ya go
I've got an RPI 3 and making a mini mamecade for my daughter and i spent a lot of time looking at scan lines and bezels in RetroPie and some of the stuff coming out on that front is pretty cool. For those using widescreen monitors playing older games it's something worth looking at.
https://www.reddit.com/r/RetroPie/comments/8x51tc/the_bezel_project_automatic_bezels_for_every_rom/
Right on, cool to hear you’re digging it too. Sounds like a cool setup. Yeah, I haven’t tried messing with any coordinates, but it looks does look like a pain. I saw someone made a visual editor, but haven’t tried it yet:
http://forum.attractmode.org/index.php?topic=1729.0