SPIC is a red herring - it may only be claimed as part of an integrated course of training. Think about it - if you are a member of the crew of a multi-pilot aeroplane you are hardly a student any more, so how can you claim 'student pilot in command' time?
Under JAR-FCL, time spent in the right hand seat of a multi-pilot aeroplane should be recorded as PICUS if acting as pilot in command under supervision, in which case each entry so recorded should be countersigned by the supervising PIC. Otherwise, such flights should be recorded as co-pilot (or P2 if not using a JAR-compliant logbook).
All properly recorded PIC, SPIC and PICUS flights may be counted as PIC towards the requirements for licence issue.