No crashes and no mods? Go with OpenMW. Otherwise Morrowind Code Patch for the original engine.
The stealing thing? I can't think of anything that changes that mechanic like you describe. Use the search or maybe someone else does.
[Edit: Actually, if you're going with the Bethesda engine then get MWSE too (using MGE XE is probably easiest, just disable Distant Land) as MWSE includes a bunch of engine fixes too]