Part A:
My vote: OPTION C
What made me really enjoy CSDesert was the 4 faction system we used to have. I always thought it was really cool for countries to support one another in alliances back in the day during raids and wars. I found the most fun in SAS teaming up with Taliban and Russia, who we deemed as our "enemies", in order to defeat the US forces in war because we needed strength in numbers. Having more than two factions created a lot of strategy and roleplay. Questions were asked amongst the SAS like: "Who should we trust, and who should we rely on for assistance? Do we think [insert faction here] is going to backstab us in the future?" It was these little things that made the server a lot more enjoyable for me when we had four factions. It would be pretty neat to have four factions again. While yes, the number of the players will be split because of this change, I think that having the choice of one or two more factions, plus the "cool factor" of having a country or two ally with you during important missions, would be really nice to have back on MRP again. You felt that there was this mutual brotherhood between you and another faction, like as if you were playing one of the joint UK-US campaign missions in the older Call of Duty games.
Part B:
My vote: OPTION B
Speaking of old Call of Duty games, I always was a big fan of CQC city fighting that occurred at times during the campaign missions. Why not have this in MRP? Fighting in a destroyed city is cool on its own, and I think the gameplay would be a lot better. The open terrains of the maps we've been using for years now has gotten a little stale for me. The gunfights always play out the same, it always ends up in two players eventually meeting up in an open field with snipers, and whoever fires first will more likely win, and not often do you engage into CQC gunfights in these open maps. Having a city with lots of tight corridors, windows, and destroyed buildings would make gunfights a lot more tense and enjoyable. Gunfights wouldn't play out the same every single time, and it would force the player to inspect every nook and cranny to make sure the enemy isn't near (as there are a lot more possibilities for ambushing, tactics, and strategy). Using cover to your advantage would become one of the most important aspects of this new style of gameplay, you would have to use barriers and any other source of cover in the city to protect yourself, rather than just using the gigantic terrain where most of the time you'll be safe because cover is literally everywhere at your usage if there is a incline of terrain near you. The player would have to become adaptive and smarter to make sure that they aren't easy pickings for the enemy, that's what I felt in the open terrain maps, new players would constantly get killed by enemy snipers because quite literally there are very limited spots to take cover when running straight at an objective, and maneuvering to flank the enemy takes 5 minutes. Sometimes this is impossible due to the openness of the area.
Part C
My vote: OPTION B
I've always wanted to more individual scouting missions, and the compromise of elongating wars would be a welcome edition. I always felt that although the war timer was cool and unique in the beginning, but the wars happened too often and played out too much of the same (maybe that's because wars have practically been the same for years now and I'm bored of the same old same old). Scouting missions would be a nice change of pace, with lots of interesting roleplay scenarios to be created off of it. Strategy would become important, and the fighting can be focused better on one objective because of this, creating more fun gunfights.
Part E:
Definitely consider adding this into MRP. I would've loved to have jobs to do during the downtime in US base back in the day. The possibilities are endless here.
Part F:
Definitely add all of these. I would love to have a skill tree to make me work towards something and earn little boosts, how satisfying that would be. Weapon skins would be awesome to have for flexing, and unique badges would make me feel prestigious.
^ Also please consider this.