You just can't pass to that guy lurking at the corner in your base anymore but this is exactly what this mod should prevent.
Before you could take the flag, use the teleporter to the roof and give it to someone on your tower or on the wall right next to your flag. Yes that is what should be prevented.
Yeah here is the disagreement, imo these are valid tactics and shouldn't be prevented. They require some teamwork and not just soloing the flagrun, so they're fun from the attacker side.
And it is not so easy to pull them off either, even with original rugby I remember on urban_c like a million times shouting GO LEFT LEFT LEFT RECEIVE LEFT LEFT RECEIVE!! LEFT NOT RIGHT!! and people just running around randomly instead of receiving a free flag. So why not reward teamwork...
It is also entirely possible but somewhat challenging to defend against these attacks, which I also find a fun challenge. These attacks work for both sides so these maps are not inherently unbalanced either.
akroseum was never really unbalanced, at least compared to a lot of other maps, and you can't really pass base-to-base there even with unrestricted rugby..