Is it safe to run uNmINeD and Minecraft at the same time?

Yes, it’s safe. I have tested it, and nobody has reported any problems.

uNmINeD opens Minecraft region files without locking (used flags are FileAccess.Read and FileShare.ReadWrite), and reads all contents at least twice to check for changes done by Minecraft and ensure 100% data integrity.

Will features from old Delphi releases be availabe in the new C#/.NET version?

Yes.

When {x} feature will be available?

I work on uNmINeD in my spare time. No when. No want. No worry.

Is source code available?

Not yet. It will be available on github when it’s ready.