After several years of existence, The Dark Mod remains the single best way to convert Doom into Thief. Hey, I'll take it - I like Doom fine, but I like Thief better.
The new version of the mod, version 1.08, adds a crap-ton of fixes and tweaks; way more than I could list here. And if you're looking for a new fan-made quest to try, the Dark Mod folks are making a big ruckus about In The North, a new fan-made mission that sounds pretty cool.
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If you've already gotten all you're gonna get out of Dishonored and need another game that lets you lean around corners, it might be time to re-fire-up The Dark Mod.
The Dark Mod [Official Site]