I would like to see the command parsing engine be
relatively intuitive, and if it doesn't have the answer to
what you need, perhaps a bit inventive also. There's
nothing more frustrating than trying to type in a
command like "pick flower" and getting back "I don't
know how to 'pick' something" or "huh?" and then you
revise to "get flower" and it says "I don't see a flower
here." or "get what?" when it's obviously in the room
description. Now, of course, filling in the blanks is part
of the builder's job for a fully featured room, but I think a
comprehensive parser is a very big bonus to a MU*
design.