I think the idea is good, I remember it was raised on one of the code reviews by @FrozenGene, to fulfill this use-case of users who are not interested in tvmc run their modules, but instead, want to get an object file to link their own apps.
The question now is how do we name optional things into tvmc. I like --object-file, but sometimes I feel we should have an action before it, like --add-object-file or --enable-object-file.
cc @comaniac that has good suggestions about naming parameters.