When both mods are installed together, any changes made to a spawners settings via the Spawner Key will reset to the default when the spawner next activates.

Disabling a spawner with redstone also doesn't work, The spin animation will stop but the spawner will still spawn mobs.

Hi @AlexTheSuprWolf, this is the author of Custom Spawns. I believe I have addressed the incompatibility issues between Custom Spawns and Enhanced Mob Spawners; please try out version 0.5.1 of the mod. If you still have issues please open an issue on my project's Github repo. Thanks!

I have tested around with it and can confirm it is fixed. Took me a sec to realize that I needed to disable the spawner override in the config but after doing that, everything worked flawlessly.