So when I was playing RwR, I was thinking of some ideas for gamemodes. Here's what I thought of.

Attack/Defense: Pretty much one team holding down a fortress while another team tries to take over said fortress.

Capture the Flag: Capture the flag, try to get the other teams flag without getting gunned down, simple, right?

King of the Hill: You and your teammates must hold down a certain area on the map until you capture the point while fending off the other team.

That's really all I can think of for now at about 1 AM.

Those are quite good ideas but they'd require custom maps for those purpose.
In my opinion before your ideas could be implemented, we'd need a user-friendly map-editor which would increase the modding drastically (especially custom maps/maps that could be implemented in the official map database) and the actual "conquer" mode should be reworked.
Actually, as soon as you have more forces in a sector than the enemy, you conquer the sector. Often it just happens, I have no clue why because soldiers are spread a bit everywhere on this sector and I don't really have an indicator about the level of power of each faction on the sector.
Maybe a ticket system with UI like in the Battlefield series should be implemented. (you need like 10 seconds to take a sector over if you have 1 more soldier in the sector than the enemy and proportionally less if the soldier difference is higher. A countdown for the sector in the UI would make it easier).
An assault mode would be nice as well. You could use "normal" maps. the assaulter would start with one sector and try to overtake all the other sectors in a specific order. As soon as the sector is taken, it can't be taken back. You'd have a specific time to take over all the map to win.

I honestly don't like the idea of an implemented ticket system, the reason I personally enjoy this game so much is because of the long lasting battles, and the hour or two long matches. But I do see your point on the map editor.

well the actual mode could be kept as it is, of course. But sometimes it just doesnt want to end... I dont always have unlimited time to play, so something with tickets and a max time could be an option.

Yeah, I get what you're saying. My answer was a tad bias, seeing as how when I normally sit down to play my PC, I have enough time for a match to end whenever it may please. From what you said, I think you meant the tickets being a possible editable parameter(by this I mean a number ranging from 500-2000, this is just an example though), and a setting that can be turned on and off, if so I agree with this.

I would also like to see some more gamemodes, especially the 1st one you mentioned.