I'm slowly working on a mod that alters nearly all existing challenges to last longer. Many non-recurring challenges that could be recurring have been made so, with appropriate increases in their thresholds. I'd also like to add new challenges based on DC area and FO3 DLC. I'd like to get input for things that would make good challenges in the same vein as the vanilla challenges from FNV. For example, adding challenges for finding the DC area vaults is something that will be done. Perhaps a challenge for finding ingots in The Pitt, things of that nature.
Most killing type challenges have been done for FNV already, so for those I'm just increasing the number of kills for the most part, so that they stay relevent as you make you way through DC and into NV.
In addition to making challenges recurring, I'm also adding perks to many that make sense, or could be fun. For example, for the challenge "You Run Barter Town" the threshold has been increased from 10000 to 75000 caps worth. But it now grants a 3 rank perk that gives you a 1/3/5% buy discount at merchants. Combined with Master Trader you can have up to a 30% discount! Another example is "Nuke it From Orbit" which has been increased from 100 to 300 kills with launcher weapons, but the tradeoff is that you now get a perk that gives +3/6/10% damage with launcher weapons.
I've barely started editing things, and am just on my first pass through the challenges. I'd like to get feedback on what people think are good challenges to get associated perks, and what would be realistic thresholds for the challenges. As I get more done I'll post up my documentation on what challenges have been changed and what the changes are.
In regards to XP rewards, do you think they should be less, more, or better should I just provide an option to tweak the reward as you like, increasing or decreasing the overall amount of XP that challenges give out?
UPDATE: Here's the documentation I have so far. spreadsheets!
And here's another document where you guys can submit challenges. It'll make it easier to keep track of in one place.

