1- since it's still a game in development, and the game's name is LITERALLY "Omega factor my dystopian robot girlfriend" YES Jun the sexbot is the ONLY intimacy partner.
2- yes that's all the current poses.
3- accroding to this cumminity's page 1 by
Incontinent Cell literally THE developer of the game , Jun the bot could smile slightely by headpatting. she enjoys it. other emotions? no idea.
4- the Omega symbol is her lust level prompt as you do her, it fills until the symbol is full before she orgasims, it's a fundamental feature, won't be removed; since it's an original design element.
5- glittering diamond?? are you talking about the art work's "light reflection" diamond, or the single piece of hair that is colored differently? there is no glittering diamond on her hair.
i am merely a player of the game, i am not among the development team, nor do i relate to them in anyway shape or form, if you have more questions just join their discord server and ask it there.