If I was hosting a default minigame I'd like if other users couldn't make a minigame. (For quite obvious reasons)
I find Kalphiter's to be more efficient, anyway. 
No Edit: As for your second statement, I believe Aloshi's default minigame does that, too. (It did for me when I previously used it)
I believe you're confused.
Aloshi's is Mandatory Minigame, while Kalphiter's is Default Minigame.
Kalphiter'ss:
-Non-admins can make minigames while there is NO default minigame.
-Cannot leave default minigame unless you're an admin.
-Does not force unspawned players into the minigame upon creation.
Aloshi's:
-Non-admins cannot make minigames period. Whether or not an admin has made a minigame at all.
-Cannot leave default minigame unless you're an admin.
-Forces players who are still loading into the minigame upon creation, which will spawn their player before they are ready.