Responsa for Bava Batra 114:2

ובהעמדה כדי לא קפדי והא תנן השותפין שנדרו הנאה זה מזה אסורין ליכנס לחצר

— The truth is, said R. Nahman in the name of Rabbah b. Abbuha, that we are dealing here with the open space behind the houses, where the owners do not mind things being stationed, but where they do mind a partition being made. R. papa said: In both cases [of the vow and of the beast etc.] we are dealing with a courtyard of joint owners, [and the reason why the rule is different is this:] Some owners are particular and some are not. Where the issue is a pecuniary one,3 we take the more lenient view.<span class="x" onmousemove="('comment',' I.e., we assume that the other residents do not mind him putting his beasts etc. there, and since they do not mind, they do not formally object to his action, and therefore it does not constitute hazakah. ');">4

Teshuvot HaRivash

Also, regarding your suggestion that some of the people without seats could put portable seats in the middle of the synagogue and sit there, or sit on rows of clean mats on the ground if they wish, for no individual owns anything other than his space and its entrance and exit access, but everyone owns the rest equally: They also may not do this. For even those who own seats, with access for entrance and exit, may not use that which is a path belonging to others ... just as residents of a street or [shared] yard may not use the street or yard other than in ways that residents normally use streets or yards ...

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