4Game

Discussion Time should ALWAYS be much longer than the Voting time.

Discussion time: The initially period BEFORE voting.

Voting time: The period in which voting will commence.

Why?
With a short discussion time the exchange will average to "Vote red" and by the time he can reply half the lobby voted him out.

However, If your discussion time is say, 40-60 Seconds you'll find yourself in a situation where saying "Vote red" is followed up by several "Whys?" In addition to Red being able to defend himself. This also allows for ripe communication such as "I can scan, empty garbage" and even confirm votes to avoid ties. 15 seconds should be long enough for everyone to vote including who ever forgot who to vote.

-Number of imposter balance
If the lobby has under 8 players 2 imposters isn't very viable, Even with higher cooldowns to compensate it's still too much for experienced players.
My suggestion

1 Imposter-35 second kill cooldown for a 5-7 Sized lobby.

2 Imposters- 40 second cool down for 8-13 sized lobby.

Lastly 3 Imposters should be strictly limited to 14-15 sized lobbies as they can quickly clear rooms and vent to stall in addition to force voting. (If someone claims blue is a little sus they can all vote him out).

-Crew vision
I find 1.0x for crew to be perfect while 1.50-1.75x being fair enough for imposters. No crew enjoys lower than standard vision while higher only hinders the imposters chances. For imposters giving them too much makes it nearly impossible for them to make a mistake meaning less timing and execution skill is required.

-Kill distance
The closer the distance the better/cleaner the kill needs to be. Lower is generally much better.

-Shapeshifter
Always avoid this for fair games, It is 3-4 completely free kills. At most add 1 but counter it with 2 angels with double its percentage.

-Visual tasks
Always on! This creates a more compelling game as the imposters have to actively kill priority targets (Cleared players) or be singled out later. Without visuals it's a game of who isolated themselves

Most importantly!! 45+ second cooldowns on meetings (or one tick less than imposters cooldown.