Here is some feedback. My wife and I enjoy playing your fanspansion but we have tweaked the rules a bit because we found that not enough tiles were getting into play and there seemed to be too much stealing of tiles. We've played several two player games with it and a couple three player games with it.
We said that if you place a cloister tile you must
draw a stained glass tile. If you complete a cloister you must
draw a stained glass tile and if you score a cloister you must
draw a stained glass tile. The reason for the must
is to help get more tiles out of the bag even if a player insists they are not trying to build the windows. Our game consists of about 12 cloisters along with 2 cathedrals and 2 abbeys. If draws are awarded only for placing and completing that amounts to around 30 draws for the game. When windows are scored and thrown back into the bag there is a good chance of them not coming out again. If we award also on scoring it can add as many as 14 more draws. This really helped getting more tiles circulated.
Regarding stealing with cloister roads we said that you don't get to steal unless you complete your own cloister road. When you can place anywhere up to 4 thieves on a cloister tile it seemed a bit much to instantly steel 4 tiles from a single player while he has no means for defense. Having to wait until you complete your road gives other players the opportunity to complete your road on you which deprives you from using that road to steal. It offers some method for defense and tempers the amount of stealing. A smart player will place a cloister tile so that it completes one or two roads instantly so he can get a couple of steals off before any of his other cloister roads are completed. He can also place his abbey so it completes one or more of his own roads - also allowing him to steal.
Even with all this we found that the number of scoring opportunities was really quite limited and it seemed to be a lot of work for not very many points. The most we ever had was one player scoring a 6 tile window. So we tweaked the scoring.
We said that each of the columns 1, 3 & 4 are worth 6 points each, while column 2 (featuring Jesus) is worth 9. This is a valuable twist because it tends to cause the thieves to target this column a little more which perhaps allows players to more easily complete the other columns. We said that any of the 6-tile combinations are worth 12 points plus a 3 point bonus for sticking it out and coupling two columns. If the combo includes column 2 then there is an additional 3 point bonus, so as much as 18 points. Either of the 9-tile combos is worth 18 plus a bonus of 6 points for coupling three columns, plus 3 points for column 2, so a total of 27 points. The full layout is worth 36 points.
I am curious to know what you think of these ideas. I don’t expect you to incorporate any of them but maybe you can use some of it.
Nice job on the expansion concept!