Server plugin

.1 we need to develop plugin for our mt5 in which we confirm client trade within delay second with worst price 

delay second   = like 2 or 3 second as we can set

worst price  = if client buy then as we set delay second in this second come price in that price  high price. or if sell then its means low price 

2   if client dont have any open position then client not able to put any limit or stop lose  

if he have 10  buy open position then can only able to putting  max 10 sell limit or stop lose only  

if he have 10  Sell open position then can only able to putting  max 10 buy limit or stop lose only