1. The calendar page has a "< Previous Week | Next Week" navgation link at the top of every page. It would be helpful if there could be a second one at the bottom.
2. Can all OW, PUT, CALL derivatives have the period information, that is, 3-day or 5-day included on the respective securities' pages. I'm assuming that certain deriavtives that span holidays will not always be for 3-day returns. Better still would be for period 'OW' totals-based derivatives to include something like: "from Wednesday 21 Dec to Sunday Dec 25 inclusive". Alternatively, just list the derivative 'halt' and 'cash out' information on the calendar page (in advance) at the same time as the derivative gets listed for trading and traders can extrpolate the period.
Right now I have absolutely no idea what formulae today's derivatives will have applied to them. I'm assuming 5-day given that they open on a Wednesday. Yet it would be really useful to be certain. Something of the same is true of securities that open LIMITED and then go WIDE.
Perhaps more traders would play these if there wasn't the ambiguity.