do we have king of the hill (or similar named mod) ?
+ a central area is the point zone (preferably a high position, but any symmetric map will do)
+ the person with X points win.
+ gaining points:
-- having the most units (by count or by acumulated hitpoints?) inside thie "point zone".
-- a certain time is required to gain a point
-- optional: while units of multiple players/hostile teams are in the "point zone" the point timer is reset/stopped, hence no point gain is possible.
+ display timer, playerscore etc.
+ team/player with smallest point coung gets extra units of some kind, escalating stronger units when change in weakest player or defined by point difference of weakes to higherst player
+ optional: multiple "point zones", each zone has its own pointer
would work for team or FFA