What I would like however... is a few name drops for the series cast in new novels from other series. That the series ended doesn't have to mean the characters' adventures can't continue. Say for example the Typhon Pact was up to something in sector 221-G, but Starfleet then informs Picard that the Excalibur had already put a stop to it or some such.
Cameos would be a nice touch, too. If Picard or Sisko attends a meeting at Starfleet Headquarters, why not have Mueller there, as well? I realize that keeping series separate is sometimes important to avoid confusing readers who haven't read each of them, but casually mentioning the commanding officer of USS Trident
isn't that big of a deal.