1. NewDark added several upgrades to the default Dromed program to make it work better: https://www.ttlg.com/forums/showthread.php?t=140097 These come with the NewDark patch, and not the program by default.
2. From what I understand, there haven't, but there's been an expansion pack of sorts called Dromed Deluxe: https://thief.fandom.com/wiki/DromEd...sources/DEDX01
3. The fan mission community is vibrant and alive. Age is just a number - if you want to get into mission-making, go for it! The community is more than happy to help answer any questions you have. You could also simply play around with Dromed or focus on a certain aspect of it, like scripting or texture-making.