[SyncEvolution] Activesyncd: todos and memos

Is there any particular reason (apart from just lack of time so far) why activesyncd does not handle todos or memos? I note that syncevolution has backends called eas-todos and eas-memos, but activesyncd only has code to handle mails, events and contacts. I agree that events and contacts are much higher priority but I am just wondering whether there is any reason todos or memos cause any particular problem. Graham