selection control

In many PC-games (countless ones), you can select units and bookmark the selection on 123467890-keys. The very same could be useful for: Marking targets for your attack-wing Linking a logic bus (a bunch of 8 activation blocks to another 8) Input commands (if we had buttons that react on being...

I know the title's a smidge confusing, and I'll change it when a better statement appears. Basically, as I'd said HERE in response to the difficulties the OP was having with rail-docking: PART THE FIRST!! : We need a way to select more than one block-type when we're doing the Advanced Build...