Normally, Monty Moles wait more time before jumping out if the level is in the Yoshi's Island submap, while Hammer Brothers throw hammers more quickly if the level is in any submap. With this patch, you can decide for every "overworld level" (see $13BF) whether Monty Moles should jump out quickly or slowly, and whether Hammer Brothers should throw hammers quickly or slowly.
You can also change the speed values themselves directly in the ASM file if you wish to do so.
update: fixed bug with the Amazing Flyin' Hammer Bro only throwing hammers in one direction, thanks to medic.
Note that for !hammer_wait_fast or !hammer_wait_slow you can only use the values $01, $03, $07, $0F, $1F, $3F, $7F or $FF, else it can produce some strange/funny results. It would be cool if the code could be repurposed to allow any value (This seems to work), but other than that good job with this.