Unrecognised files can only be blocked (HIPS needs to be enabled) or trusted as completely safe. We have only those two options there in context menu. However Behaviour Blocker also have Exceptions list (needs to be enabled) which only pass such file (or folder) from BB, but not from all components. This list can be edited manually, but there is no quick option to move there unrecognised files. It could be much safer than trusting such file especially when BB is in “blocked” mode.
So my suggestion is to add third context menu option to move unrecognised file to exceptions list in BB.
Edit: Such option could also be in Rating Scan (currently we can only trust). KillSwitch could also allow adding to exceptions and showing such status in rating column.