To start, i want to say i take no credit for these features. i'm only conveying some details that most people probably don't know.
all credits go to Biney (original grimoire creator) and primarily EmperorArts (grimoire 3.8+ modifier) for making most (if not all) of these particular, very useful changes
first, if you click a command that's already part of your bot and you want to add a new command above it, all you have to do is control+click instead of just left clicking when you want to add it. if you try it out first you'll very quickly see how this works. why is this great? well, you don't necessarily have to physically spam left click to get your commands where you want them
for joining glitched rooms, you can type mapname-Glitch, so icestormarena-Glitch and it will actually go find it for you. i've tried this in citadel and it first tried to go to tercess 9999 but it was full so on its own it went to 9998 which had people in it. i don't know how reliable this feature is but it's pretty cool in my opinion. apparently if it can't find one, it will go to a normal room. make sure the G in Glitch is capital. lowercase it won't work.
in the box where you can see all current commands/drops/etc, if you click on any command, you can then use the letter keys to navigate around the bot. for example, pressing k will go to commands that start with k within that particular menu. if you're on drops, pressing a would go to the next drop with name starting with a. note that it's not clear whether Biney or EmperorArts created this particular feature. the others are all definitely from EA although the base of the bot itself is Biney's.
in the bot itself, and in the packet spammer, you can use {USERNAME} as an automatic placeholder for the name of your current character. for example, %xt%zm%cmd%1%tfer%{USERNAME}%icestormarena% will work. fun huh? you no longer have to go and manually put your name in
this next one is really great. go to a quest like VHL challenge (tools > fast travels > private > taro). click the guy on the left's quest and open it up. now go to tools > loaders and grabbers > click box with the arrow above the word grab, go to quest items/drop rates then click grab. you should now see the quest. now for the cool part. right click it and wow, you can add it to quest list. click the plus sign and you'll see two new options: required items and rewards. right click both of these and you can add them to the drop list! now re-open the bot and you can check the quest and drops menu and everything will be there! keep in mind the required items are only those required to complete the quest so those will be the ones added. the items required to actually
accept the quest are not automatically added so you'll have to do that on your own if you want. but this feature eliminates the common mistake of forgetting to add what you're farming for or trying to pick up to the bot.
one slightly more obvious one is: you can double click an existing command to edit it (don't know who made this one in particular either)
credits for these features go to EmperorArts:
https://www.mpgh.net/forum/showthread.php?t=1452109
if you're wondering how i learned them, i actually read the changelog

(except the letter-key and double click). who even reads documentation? me apparently lol
credits for the massive project that is grimoire itself obviously go to Biney:
https://www.mpgh.net/forum/showthread.php?t=1340281