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Ok. That kinda sucks...Moddable?

I believe you can change it by editing the defines.txt found in EUR/common folder. Just search for annex.

2 # _DIPDEF_MAX_ANNEX_SIZE_ (Countries of this size or less can be annexed)

Never tried changing it, though. So, no idea if it works.
 
I believe you can change it by editing the defines.txt found in EUR/common folder. Just search for annex.

2 # _DIPDEF_MAX_ANNEX_SIZE_ (Countries of this size or less can be annexed)

Never tried changing it, though. So, no idea if it works.

It works. Although you must remember that it works for you, but also for the AI players. If you change the value to four, the Seleucid could swallow Macedonia in one move.