Thanks to Advisor and as well as some other Co-Admin & GMs helps...
I managed to update a list of things for your guys to set a guideline...
--- Spamming Issue....
So far Admin did a very good job on SQL which spamming of skill will not dc anyone... but nevertheless..... do not abuse it.
----- Spawning Issue...
Summoning bags by users/ maplers/ players.... spamming on spawning monster through summoning bags will result in dc.
As for spawning event for GMs, spawning of monsters or whatsoever set a limit of 10-20 per few minutes or seconds. As mass spawning also result in dc.
----- Leveling Issue...
Mass level WILL ALSO result in dc yea. Although rates is good in our server ya... but u mass level once after your rebirths, like example from Level 1 boost to 2nd Job or beyond 3rd job. It is not advisable. Unless u are "OKAY" with dc.
----- Warping Issue...
Mass warping users/ players to certain map or random maps in seconds like different towns in short time will result in dc too.
More issue...will update to your guys.
Happy mapling!