I would like to point out that Juggernaut is just a glorified DM and I dislike it. I suggest making kills only valid if you're the juggernaut. Food for thought.

One possibly fun game mode is "King of the Hill". This game mode could be used on any map where a capture point is in the middle. In order to be considered King, you have to touch the point to capture it. The person with the most time with the point captured wins. This could be boiled down to a mix between modes CP and DM.

One of my ideas for supplies is retro-reflection panels. These panels can be selected by either picking them up in supply drops or buying them in the garage. They hot key should be 6 and gold box can be 7. This supply allows one's tank to be nearly invisible for only a few seconds. As the tanker upgrades their hull, the supply will last longer. The supply should last no longer than 15 seconds.