For my usecase I miss an option to lock items during the checkout. I would like to checkout a file from PTC, refresh the data, and then check it in again.

The plugins performs a checkout, but the files are not locked and so they are readonly on the disc. I now just modified my build script to remove the write protection, but I think the correct way would be to lock the files. 

Additionally all users would then know, that a build is running. But I think the overall behaviour depends on the usecase of each user