[Norck]

On future: all server limits you can find here
https://sampwiki.blast.hk/wiki/Limits
Q1:You can add more objects, if you will use a Streamer.
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Q2: Don't know what exacly you need, but i think
https://sampwiki.blast.hk/wiki/SetPlayerMarkerForPlayer
and
https://sampwiki.blast.hk/wiki/SetPlayerColor
will help you.