hidmacros.eu

You can check current time in lua (standard functions), store it on first press and check on second

One variable can't have 2 values - as you test in your condition.
You would need some flag to set on enter down and test it later

Isn't 00 just sending 0 twice? I doubt windows would detect 00 as unique key...

Use lmc_send_input - one call for ctrl down, another for ctrl up

AFAIK you can send F13-F24 from the macro but you need some software which can receive it and do the action (like AutoHotKey or directly the program you want to control).

Don't call lmc_device_set_name twice in your script. Try to remove the first call and keep the one in print.
Regarding 000 - probably could be with some scripting (including time measurement and ignoring quickly followed presses) but not sure if you can recognize "regular 0" and first of 000

Then you can't (without scripting)

Not yet...

You can call lmc_set_handler to bind only one key, not whole keyboard. Check wiki at github.

In luamacros that would be possible with some scripting. First press remembers timestamp, process the macro and following callbacks would be ignored in some time interval after first press (using that timestamp).