New options should be:
- starting extraction speed,
- ending extraction speed,
- amount of metal extracted before speed become "ending",
- law by which speed is decreased (linear, 1/x, cut-off).
[cut-off - for example, in Starcraft starting speed for gas extraction can be counted as 8, and ending - as 2; for minerals ending speed - as 0.]
Better to make counting of extracted metal for each spot, not in sum. But if too hard for programmers or they are lazy, for beginning may be overall counting.
This will make game more strategic, like classic, non-meaty games.
P. S.
Simple decreasing of extraction speed (which was available before physical servers were changed) was not enough. Players should have options to set finite metal.