Mines: It would be cool to have mines to create ambushes.

Swim under water: Able to swim under water with combinations to infiltrate the enemy.

Maps inside: Much darker cards interiors where one would have to use flashlights to see before us.

More interaction with the universe: Could raise / lower a bridge, breaking windows with our fire, explode cars, etc...

PS: Sorry if my words are risky, I'm French and I use google translation.

I think all these things have already been discussed more or less... Here's how I've understood it:

1. Mines are planned
2. Although this could be useful for stealthy actions, it's considered as a bit useless (I also think it wouldn't be so simple to implement)
3. Dark areas/nights where you have to use flashlights or other light sources would be cool, but the engine of rwr could not master it (right now )
4. Explosions (and also destroyable terrain) are also great additions to the game, but very hard to implement (that means no implementation before ver. 1.0)

As the devs would say now: "Great suggestions but we have to focus on many other things first" (but of course they are right). If there are some things which I missunderstood I really apologize that...

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Creator of the "Alternative Icons" Mod (http://www.modulaatio.com/runningwithrifles/phpBB3/viewtopic.php?f=11&t=1764)

Thanks for your answer.
I tend to be a little too ambitious and say a little anything.

The explodable cars are quite doable -- all you need is to replace the "terrain" cars with "vehicle" cars. Bonus points if they're drivable.

This is absolutely true, btw. Would be highly interesting to see the impact on performance / network data amounts.