Coherency for converting stereo audio files to mono needs to be improved within Cubase.
(1) Importing Audio Files:
Add a “Mono Downmix” option into the Audio file import options.
(2) Audio Pool / Convert File:
In the Audio Pool / Convert Files options, add a “Mono Split Channels” option and a “Import File Onto New Track” option which would save time from having to perform the additional process of manually importing the files from the Audio Pool back into the project after having converted them.
(3) Toolbar - Project / Convert / Split Multi-Channel to Mono:
In the following toolbar menu - Project / Convert / Split Multi-Channel to Mono. This should include a “Mono Downmix” option and a “Import File Onto New Track” option.