AH, thank you!! Time to mess around..
Jeez this gets me too excited.. Why am I so giddy over something like this?
'Cause custom categories mean you can separate your own custom blocks into there own category! 
I KNOW AND ITS GREATT.. So neat!!!
I have used this for over a month and you just found it?
some people don't pay attention to things like that. or maybe they just haven't really used 7.0.
why does this sound aggressive?
One of my only times using Snap 7.
Correct.
sorry I was talking to warped and ego-lay_atman-bay
I don't really keep up with snap 7, and I only test stuff out when someone posts here.
hey, I just found out that you can now drag blocks out of the "unused blocks" and "export blocks" dialogs.
I knew about that a day or two ago.
I just went back to snap 7 today, and was going to look at the hidden HSL setting, when I saw this
you can now turn on a setting if you don't want to click blocks to run them.
Interesting! I think it's experimental, looking at the commits.
I think I've found something...
Was that sender's option always there? Also when I click it, it does nothing (to my knowledge and sight).
6.9 has that.
Make 
in a sprite, make 
in another sprite, and try it.
the senders option is already in snap. What it does, is, show what sprites are broadcating the message, or in this case, broadcating green flag.
There's a corresponding item on BROADCAST, called "receivers...", too.
I know, I did mention
That's the "senders..." one.