It does tell you on the HUD when it's the final round. If time is being added to the clock, that generally means that the next time red team attacks, it's the final round (unless they are very quick rounds).

The system I have now runs as many rounds as it needs to come close to the server's time limit, while still giving both teams equal opportunities to attack. If I could, I would hide the map timer, and just call it "overtime" while the last rounds are being played.

Yeah I'm just saying have an indicator somewhere constantly on the hud that shows the round you're in because what if you come into the last round after the last round message appeared? No clue what round it is or even if there are rounds in the first place.

It says "FINAL ROUND" on the hud constantly if a round starts less than 5 minutes before the map would normally change (the server's default mp_timelimit).

A map could last 2 rounds or 20, depending on the server's map length and the speed at which captures occur. So I don't see how counting them could really help, though it could be easily done. The real confusion, I think, comes from adding time to the map timer. Unfortunately, I can't stop the timer, nor can I stop the map from changing when it runs out, so adding time to it is all I can do.

Ok, this is done. One round consists of both teams taking a turn attacking. FINAL ROUND displays if blue team starts attacking with <10 minutes until the original mp_timelimit.