Please no. Just let scrims end in a draw if the full 4 rounds end up as a draw.
If it's two maps, it's less likely to be a problem. Also, if clans stop thinking of scrims as something they have to win and as something they should win in order to increase their clan's score, then people would camp less because camping means not winning. The current way scrims are set up basically means that playing to not lose is better than playing to win, because at the very least you won't lose. In games like CS:GO, online leagues last months and teams play at least a dozen matches. In some leagues, each team plays each other team twice (on their own map pick and on the other team's map pick) and draws (1-1) are common. Since the points add up over a long time, there is a massive incentive for both teams to play their best and win every single map. Ignoring the fact that CS:GO doesn't have draws, if Tremulous had a page where scrims were recorded and clans would accumulate points over time, that might disincentivize camping to time limit, since an actual win would increase their ranking over other clans much more so than a draw would.
There are a couple problems with this. We would need something to give the exact time when the match ended. The timer keeps going after the game ends, so screenshots after the game ends wouldn't always be at the correct time.
Also, there's the other problem: this encourages a losing team to draw out the match, since it would make the game last much longer. It also encourages the humans to not go all-out since if the aliens base rape and win early it gives them a huge advantage.
The 1v1s in soccer feature both teams attempting to score on the goalie. A 1v1 in Tremulous would still need to have the players play on each side once to be completely fair, and would just extend the length of the scrim drastically. I really don't like this idea, and I don't think Tremulous can be compared to soccer in any way whatsoever.
That's why you build a base that can't be hopped.
It's worth noting that many, MANY people complained about the Overwatch sudden death system, and the devs have said they are considering changing it for the next season.
The problem with this is if, for example, NoS wins on aliens of ATCS, then Fk wins on aliens of ATCS, then Fk wins on aliens of Niveus, NoS won't have their chance to play on aliens of Niveus and even the score at 2-2, even though Fk just played on aliens twice in a row.