I think that would be confusing to new players. It would look like the hexagon green is just a special type of territory for the green players. It also becomes harder to see who owns what at a quick glance: what if green-circle and green-hex players are right next to each other? You really have to look carefully to see who owns what.
We also use colour coding in a lot of things outside of the map: the username in chat and game log; the arrow shapes in the list of players, etc. I don't think using different shapes would work.
That brings us back to colours. Not only have the new colours be distinguishable from the underlying maps (we could easily achieve that by shadows and glows), but we also have to consider distinguishability for colour blind users. Our current colours aren't perfect, but additional colours are not going to make it easier. We could decide to limit the choice to the first 9 colours for games with 9 players or less and limit the distinguishability problem to 10+ player games only, but it's not really a solution.
I think in the end the question you have to answer for yourself is: is the demand for games with 10 or more players - a game mode that hasn't been tested, won't work very well on many maps, doesn't really fit the interface, and may do weird things with the cards - really big enough to warrant a likely negative user impact into the site's usability?
I think that would be confusing to new players. It would look like the hexagon green is just a special type of territory for the green players. It also becomes harder to see who owns what at a quick glance: what if green-circle and green-hex players are right next to each other? You really have to look carefully to see who owns what.
We also use colour coding in a lot of things outside of the map: the username in chat and game log; the arrow shapes in the list of players, etc. I don't think using different shapes would work.
That brings us back to colours. Not only have the new colours be distinguishable from the underlying maps (we could easily achieve that by shadows and glows), but we also have to consider distinguishability for colour blind users. Our current colours aren't perfect, but additional colours are not going to make it easier. We could decide to limit the choice to the first 9 colours for games with 9 players or less and limit the distinguishability problem to 10+ player games only, but it's not really a solution.
I think in the end the question you have to answer for yourself is: is the demand for games with 10 or more players - a game mode that hasn't been tested, won't work very well on many maps, doesn't really fit the interface, and may do weird things with the cards - really big enough to warrant a likely negative user impact into the site's usability?
“This is how humans are: We question all our beliefs, except for the ones that we really believe in, and those we never think to question.”
- Speaker for the Dead, O.S. Card