Having now planned and flown plenty of international trips with the able use of SkyDemon, I reckon it would be rather nice for the programming to have the facility to automatically identify when you are crossing an FIR boundary and to automatically present the FIR ID (eg EGTT, LFRR, EDLL or whatever) either in the PLOG or simply on the displayed chart alongside the crossing point. Such FIR ID changing as necessary when reversing the route.

At present the FIR ID's aren't displayed (or I can't find 'em!) and one has to look elsewhere.

eg Flying Calais to Koblenz one crosses from France into the Belgian FIR (EBBU) thence into the German(Langen) FIR (EDGG) and the reversed route to show change in FIR entries (in this case Germany(Langen) (EDGG) - Belgian (EBBU) - France (Paris) (LFFF).

Is it even possible? 

You could also "rubber band" the route to give a relevant point on the FIR boundary itself. Will enable you to inform ATC of expected FIR crossing time. Is the name of the FIR region needed?

Also, its worth turning on Airways Reporting Points, as these are often on FIR boundaries. In your example IBESA is almost on track but nothing worthwhile on French border.

David