First of all, it has to be said that ALL commands are written in chat rather than console.
sapp is a software similar to gandanur or phasor whose purpose is to run the server. It also allows the commands to be simplified while offering more functionality:
1) no_lead: in general, it is already included in recent console and PC games. It controls/disables the shot-lead due to ping (in halo, it is not natively implemented). It is not a problem when the players have a good ping, but (as an example) for anyone facing Mil or kingas who usually have an elevated ping it is frustrating to die over and over again caused because they kept missing shots. Even more so, it is possible to apply a custom lead to the server, so it is not completely disabled but adjusted to be fairer to everyone.
2) antibot: cannot be more explicit. This bans automatically all the aimbots and aim-assist cheaters (it won't ban automatically those extraordinary 50-under-a-minute killers tho)
3) kick/ban with incorporated explanation: besides kicking the player, it is possible to put the reason behind the admin action directly in the log, preventing the need to have a good memory or writing it down elsewhere
4) admin's antiban: it disables the option of kicking/banning another admin from the server
5) sightjacker deactivation: mostly focused on preventing guests from using it, as it allows admins its free use
6) score storing: if a player quits the server and later rejoins in the same game, his/her stats are preserved and reinstated, instead of starting over from 0
7) the admins won't be needing rcon password, it is possible to give admins powers via the IP+hash
Other functions:
- muting overly rude/profane players instead of kicking/banning them
- map skipping based on player's votes
- autokick afk players (custom time in seconds)
- automatic autobalance
- spammer automatic muting
If you happen to be interested, check its official site:
http://halo.isimaginary.com/