''Yeah, but in Class D nasty Old Duty Of Care will rear its ugly head and the LCEs will expect a so-called 'best practice' element of lateral deconfliction from head-down IFRs busy watching instruments, the IFR pilots occasional get upset if they look up and get a nasty surprise and see a VFR self-separator playing it too close for their comfort''
Pass traffic IFR to VFR and vice versa, if the pilot of IFR requests further separation, provide it. No need to worry about 'duty of care' - just do the job of an ATCO (Obviously this will vary from unit to unit depending on levels of traffic etc). Not sure why following the basic MATS 1 rules should agitate any LCE's?.