I think this idea is better framed as "highlighting" rather than "searching." Presently I have to use the remove tool to basically take away all the blocks of that type and then I either hit "undo" or I place them again manually. I tend to do this a lot when I forget where the faction block is and I want to move it to a secure location after working on a ship for a while. If I could simply have it highlighted, that would be awesome.