DooM MOD Ideas

I came up with a couple of awesome ideas for DooM MODs this summer that as far as I know somehow still haven't been created! I contemplated looking up some brilliant WAD/MOD authors to see if they could make them reality, but as I still haven't gotten around to it I'm opting to just post them here.

If you happen to be one of those brilliant people who might be able to breath some life into these ideas, please do so! I'd love to get credit where it's overdue, but more importantly: I'd love to play the game with these features enabled! So if you do something with these ideas, know someone who has or know someone who can, do let me know. Without further ado, the ideas:

Showdown/Kill em All - One final level after boss level where all foes you didn't kill earlier in game levels (bonus if: applicable to both official episodes and custom wads/megawads) spawn. Alternatively they could spawn in the final level, right after the boss, or at the beginning, as if they're doing one last attempt at killing you off for good. Makes 100% (or as close as possible) kills on each level a bit more rewarding, as it'll all be part of the overall challenge.

Free Roam - Skip transitions between levels. Make all levels connected, so that you can go back to past levels to collect weapons/ammo, kill off enemies, etc, by simply moving through the exit doors. Kills, Items; Death stats are counted accumulatively for entire wad or megawad. Optionally, to make for continuity: if you die, you spawn at the start of current level, with a certain weapon/ammo penalty (you don't lose everything).