Hmm, I guess it would make sense, but right now the current support does not allow combining multiple checksums, i.e. it's one checksum per file. It may not be too hard to get that supported too though; basically just accept a list of tuples instead of a single tuple as well, e.g.:
```python
checksum = [[('md5', 'afe95929'), ('size', '123456')], ('md5', '491abed')]
```