It would be helpful, to put a default draw distance of a server for everybody.
E.X.
onActivate>setAllPlayerDrawDistance>l-l-l-l-l-[]-l-l-l-l-l {Admin} - Effects everyone
1000
And
onActivate>setPlayerDrawDistance>l-l-l-l-l-[]-l-l-l-l-l {Any one, as it only effects one player}
1000
Also, a /setdrawdistance<:amount:> {Admin} - Effects everyone
Last, in the Admin GUI, you could have a button that says "Set Draw Distance".
When you open that you get a: l-l-l-l-l-[]-l-l-l-l-l
1000
Which can change to:
[]-l-l-l-l-l-l-l-l-l-l
0
Or:
l-l-l-l-l-l-l-l-l-l-[]
2000
Or anywhere in between.