make the players of the light and dark sides can go through operations together, in search of a group. how much can you wait for this already? in pvp already done! there are fewer and fewer players on both sides. or merge the servers again.

1-No need to merge the servers. It'd cause a lot of lag

2-Operation groups form daily, keep an eye on Fleet and raid channels.

3-Though I wouldn't mind cross-faction PvE it may not be feasible to implement it. Though hopefully the devs will one day allow it.

make the players of the light and dark sides can go through operations together

That's already possible. No matter how you form your group, it matters not one little bit if you have a light or dark leaning character. Of course what you probably meant was forming groups with Impside and Pubside characters together, which is a question on which I have no firm opinion.

Some of the operations and flashpoints are cross faction story wise so it would be cool if there was an option to group cross faction for them.