The relevance of Extended rounds on RP

[Kotlol]

All of these can extend to be most of the shift, leave room for shenanigans, and can help encourage antags to join in and maybe get a little brave and do some certified cool escalation. 

Sorry but this last setence made me facepalm and laugh. You are talking about EXTENDED, they are no antags in EXTENDED.

That said... most of this stuff you mention can be done during an antagonist round too (I think you mean that, cept the light crime and prank wars)
I do that in general as a Captain. Do lil silly gimmicks that is ment to make antags more willing to sabotage or play along with my gimmicks.

I outlaw weed? Now the antags can become drug dealers. (Heck one time I set up with botany and security to RAID their weed stash, but it didnt play out since the antagonist decided to go on a killing spree before security could do that D: )

I decide to make the AI, The employee of the month via a law? Sounds like a fun moment to try and steal it from the AI.

I put bounty on getting me a croissant like AA? Sounds like a good moment for an antag to find a croissant or force the chef to make one to get that AA.

Anyway back on topic.
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You are basically saying Extended are the perfect time to do funny little things like slumber parties since no antags are around and people are bored.