If enemy thieves stealing weapons is seen as so taboo and unfun... then why make it so they can steal items with your stuff in the first place? :/
Hypothetical example: you have a not exactly rare but very expensive item in your inventory. And then it gets stolen.
How is that any better or worse than what I'm trying to do? I'm just trying to take what you had and apply it to stealing other things, which I'd logically think would be smart for a thief because they should naturally have eyes for more than just items, but also gold, armor, weapons... loot comes in many different types after all. Or at the very least, they're more likely to rob you of gold than inventory stuff.
Just wanted to add my two cents. Little Adventurer, I have played a lot of RPGs and I have to say that in many of them my character will charge head first with no fear into dragons, demons, armies, etc. But one rust monster (D&D, destroys gear) or grey ooze (also D&D, corrodes gear) or gelatinous cube (does what your slime does in D&D), etc, and whatever character I have made will do their best impression of the lady in Tom and Jerry when she screams, jumps on a chair, and throws things at a mouse. Because of this I think it's an awesome mechanic (because it's terrifying). That being said I so absolutely no problem with it if it is used rarely, though if it is a common enemy I would agree that it would be frustrating.
As for getting this to work, I have a little piece of advice....
Stop. Just for a little bit. It is more detrimental to get hung up on trying to accomplish one thing and doing nothing else. Move on and do something else and let future you come back and fix it (because future you will be better at it

) When I get hung up on something (and as a super analytical, almost ocd type person, it happens often) I have forced myself to move and leave a note behind, so I won't forget and will be able to come back at it later, especially with anything involving scripting. Scripts can freak out over the simplest things (did you know the semicolon ";" has an equivalent that can be entered called the greek question mark ";" and it looks the same but ruins the script), so coming back with fresh eyes will let you notice if something is awry.
As for the note, I use something blaringly obvious.. it dots my project everywhere; and I am not a brony, a friend of mine is, and unfortunately for me I am well aware of the characters names
Anyway, I like this picture because it's hard to miss (some entire maps have it as a parallax) and makes it impossible to forget something when playtesting rolls around, also, coincidentally, that is the face the future you will make when you figure out what the past you was doing wrong.
I am in the same boat as you are as far as wanting to actually finish something. I have tried writing novels, over and over again (hate my own writing style), screenplays (still hate my own writing style) and even recreated my own world lore to fit D&D (wrote several books that are still played by many groups to this day, though I still did not finish that either). Just keep in mind that the professionals in game design are limited by four things; personal skill level, time, resources, available technology. If this is going to be your Magnum Opus of Completing Something, just keep in mind you are only limited by personal skill level, resources, and available technology, but not time
If you want to bounce around story/game ideas feel free to pm me
Now, Yanfly, sorry for the super long superfluous post, and for this question I am about to ask.
Your tips and tricks for stat upgrade on your website has two people trying to figure out a way of implementing a per use increase to the stat cost. Mortalis used skill.learnCostJP +=25, which works, but 1990pink replied that it only works per session and when you relog it will show the reduced amount but still deduct the increased amount. Do you know of a work around in your lunatics? I am trying to create a system kinda like dark souls stat increase, but nobody appears to have figured this one out. If not than I will just create several copies of the skills with increasing costs that replace the previous one, just wanted to save on database space. Please and thank you, you sexy awakened AI rabbit you.