Review and modification of a working simple EA

I have a simple working EA based on 9-12 LWMA moving average. I have the option to set the number of maximum trades but it is not exactly what I need. Currently the EA limits the number of total trades for all the pairs that the EA is attached. If the maximum number is 5, it gets up to 5 trades for different or same pairs, sometimes it is 5 trades for the same pair, sometimes 1 for each pair.

My requests are:

a) A general review of the EA for errors or update/correction if necessary,

b) to be able to set a maximum number of open trades, for example maximum 5 open trades at a given time even if the EA is attached to 10 different pairs/charts.

c) to be able to set the maximum number of open trades for different pairs separately, for example 1 open trade for EU, 2 for UJ, 4 for Gold

As in this example, if the total number of maximum trades set for specific pairs (c - 7 trades) are more than the number of total trades allowed (b - 5 trades) then the EA should stop after the 5th trade.

Currently the EA has "Wait_Mins_For_Next_Trade" feature. I am able to set different waiting times for different pairs that the EA is attached. I would like to be able to do the same after the modification above, for example 1 minute wait for EU, 2 minutes wait for UJ and 0 minutes wait (immediate execution after the closure of the previous trade) for Gold.