I rewrote the whole mod.  A lot of stuff is different, and should hopefully provide a better experience.

Edit four hours later: crown scaling is now n instead of n^2.  That was not intended.

• merged mutations have been split into two mods, fake mutations.mod.gml and merged mutations.mod.gml
  • merged mutations is the actual content, fake mutations handles all the behind-the-scenes stuff
• merged crowns have followed the same process as above
• added button helper.mod.gml
  • button helper adds a random button and lets you scroll when there's too many options

• mutation and crown generation should be much faster
• vastly improved the implementation of crowns, they're more accurate and stack better now (thanks Yokin!)
• a crown that combines all others will always be available in the vault
• regular crowns are left untouched in case the generation was not in your favor
• mutations and crowns now have loading screen tips

• custom options support (included in this download, don't worry about getting it separately)
• forcing x10 features has been replaced with a slider to scale mutations and crowns from x1 to x10 times their strength
• mutations can now give a fraction of their effect (rounded up) with a new option
  • if you have a skill that's 1/4th stress, you get 1/4th of stress' firerate boost
• player HP and ammo are now rounded unless disabled
• patience-gained skills can now be random instead of inheriting from their parent
• max pieces for skills and max pieces for crowns are now separate
• crown of blood's scaling has two modes
  • mode 1: increasing chance of an enemy spawn per floor tile
  • mode 2: running the spawning script <scale> times
• crown of blood's rad penalty can now be capped at 1
• new option to make vaults infinite (maybe don't leave it on for the whole run?)
• merged crowns can now either pick pieces from any loop or only the current one

• options and variables for the current run should persistent through reloads in a more reliable way
• all types of generated content can be deleted with their own commands
  • this might help with long load times if you're reloading the mods
  • I say might because I don't know what I'm doing
  • don't use it mid-run
• long arms now reaches through walls properly
• improved gamma guts and strong spirit code
• improved crown train support
• crown train features can no longer be forced

As always, please report any bugs or errors you encounter.