So I've spent the last hour trying to figure out why the two new Laboratory enhancements I've "added" are not showing up as I've copied both the laboratory.gb and effects.gb into a mod folder, changed them by just adding new entries next to the old ones but the problem is that I'm getting no option to use them and the only Error I'm getting is,

SCRIPT ERROR: traitpanelshow: Invalid call. Nonexistant function 'dictionary' in base 'Nil'
    files/scripts/Mansion.gd:3834

Which is linked to the Trait Removal button not the Enhancements button

To effects.gb I've added,

augmentmaf = {code = 'augmentmaf', maf_max = 2},
augmentend = {code = 'augmentend', end_max = 2},

 and to laboratory.gb I've added,

"maf" : {price = {mana = 75, gold = 200}, items = {bestialessenceing = 2, magicessenceing = 2}, time = 5},
"end" : {price = {mana = 75, gold = 200}, items = {bestialessenceing = 2, natureessenceing = 2}, time = 5},

if person.mods.has('augmentmaf') == false:
    newbutton = get_node("labmodpanel/ScrollContainer1/secondarymodlist/buttontemp").duplicate()
    newbutton.visible = true
    newbutton.set_text('Enhanced magic')
    get_node("labmodpanel/ScrollContainer1/secondarymodlist").add_child(newbutton)
    newbutton.connect("pressed",self,'customenh', [dict[string],'maf'])
    newbutton.set_meta('effect', 'maf')
if person.mods.has('augmentend') == false:
    newbutton = get_node("labmodpanel/ScrollContainer1/secondarymodlist/buttontemp").duplicate()
    newbutton.visible = true
    newbutton.set_text('Enhanced endurance')
    get_node("labmodpanel/ScrollContainer1/secondarymodlist").add_child(newbutton)
    newbutton.connect("pressed",self,'customenh', [dict[string],'end'])
    newbutton.set_meta('effect', 'end')

elif modification.code == 'mod' && action == 'maf':
    text = "Due to magical augmentation, $name's magical affinity will have more room for growth. (increases maximum magic by 2)                                \n\nRequirements:"
elif modification.code == 'mod' && action == 'end':
    text = "Due to magical augmentation, $name's endurance will have more room for growth. (increases maximum endurance by 2)                                \n\nRequirements:"

elif result == 'maf':
    person.mods['augmentmaf'] = 'augmentmaf'
    person.add_effect(globals.effectdict.augmentmaf)
elif result == 'end':
    person.mods['augmentend'] = 'augmentend'
    person.add_effect(globals.effectdict.augmentend)

 I'm not sure whats wrong as I added the new entries next to the ones for enhanced str & agi, I also used notepad++ to search all scripts files for references to "stat"_max and augment"stat" and didn't find anything that seems relevant.

I was interested in the same idea.  I found one more spot that needs to be edited and I think it ties to the trait box

add to  characters/description.gd  about line 169 or so where "augmentstr" is located

if person.mods.has('augmentmaf'):
text += "[color=#B05DB0]Through magical modification, the potential of $his magical affinity has increased.[/color]\n"
if person.mods.has('augmentend'):
text += "[color=#B05DB0]Through magical modification, the potential of $his endurance has increased.[/color]\n"

The other thing to watch out for, which bite me, is that you need tabs not spaces and I have my Notepad++ set to put in spaces.  So turn on the show all characters to make sure it is doing it correctly.

Thanks D.stu and dirdir for the suggestions, changing the characters/description.gd worked and the new options show up so double thanks to dirdir.

The funny thing is I started getting all sorts of errors when I tried to make it a MOD but if I just change the games base files it works fine... but it works and that's all I care about.

Can you give us one link to download your mod?