To celebrate my reaching TL2, here is a feature I have been considering for a while.
When there is no Approach control but the airspace is busy, it is common (even on Expert) to see pilots failing to understand the sequencing instructions they are being given, specifically with regards to which aircraft to follow. Similarly, even when you are closely following the radar map to try to determine where Tower wants you it’s not always easy to work out, especially when there are departing aircraft on the downwind and base legs confusing matters.
My proposal is a relatively simple one (although whether that is the case for the developers is quite another matter!). When Tower gives a sequence position to a plane, it could show up on the radar as an additional line of information, along with the runway for which the pilot should be aiming. The latter would allow for sequencing at larger airports with more than one runway.
In the example below I have used ZSQD/Qingdao Liuting, but have just randomly shown runway 27R (rather than the real runway 17) to demonstrate what I mean.
As a potential additional part of this, I have turned the text green for the Swiss 1 11 plane to show that it has been cleared to land.
Some additional functionality, as suggested by replies below (thanks both!):
When aircraft lands, its sequence number disappears and those behind it tick down by 1.
If aircraft does a touch-and-go, it would not retain its sequence number - scenario as for landing aircraft, and it would need a new sequence number from Tower.
When an aircraft announces a go around or missed approach, its sequence number disappears and those behind it tick down by 1. Aircraft would require a new sequence instruction and number.
If Tower decides to slot another aircraft in before one that already has a sequence number, the numbers for those that will now be behind it tick up by 1 (but I would advise that Tower still needs to issue the communication to those aircraft to advise them, as ATC currently does most of the time).
I believe this sort of functionality on the map could help to allow pilots to get in the right order more easily, given neither they nor the ATC have the ability to communicate in the way towers and pilots do in the real world.