I don't think so, but you could put all of your attacking force in a control group ahead of time. I use control group 0 to select all of my forces, and 1-9 to select specific groups of ships. To add groups to a control group, use ctrl + #, and then just push the # to select them. The only problem this way is if you have parasites, then the new ships won't be in the control group. Also I have to re-define each control group after pretty much every battle since I have to replace my losses with new ships.