Can you be a bit more specific about what you mean exactly?
OK, you know the little cards in the lower right hand card? If you left/right click on those, you go through various events in the que. Do the same thing, only let me click on the individual ship classes, and it'd "scroll" through the various ships, focusing the view on whatever ship has the "focus" at the time.
E. G. something to the following effect:
I need one of fleet 1's light cobalts to detach itself from the fleet and jump down the jump lane to find out whats at the next (unexplored) line in the chain, because I haven't been able to sneak scouts past the enemy screens this far. I can either hunt through the entire system its in to find one, or...
Put the mouse over the "1" shield, then Alt+R click on the shield to "lock" the infocard indicating ships in the fleet into its open position, then scroll down to the cobalt line. Every time I click on the "cobalt" category, it centers the view on a given Cobalt in the fleet. If I right click, it backs the selection up one, if I left click it advances one (in the "list" of ships -- even though the ships are displayed in one line there, you can see by tabbing through fleets that the fleets "remember" which order ships were added to it, so there is some kind of list there).
Understood?
I don't really see a point if you can just alt+click a ship and select all of them that way.
Because... sometimes I'm hunting for a given ship across my entire empire (e. g. that one colony cruiser that was over here... somewhere...), or I just can't find my light frigates in the rather messy combat over here...