I use my personal world to build schematics. However, my small brain cannot handle making a schematic. My solution is to use structure blocks, move it to the schematics folder, and convert it to .litematic using the mod. However, it is annoying to move the structure to the schematics folder. Is there a way to add an alternate folder?

Adding a configurable "global schematic folder" is on my TODO list, so yes it will be coming at some point.

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As to making schematics, I'd suggest that you simply switch the Area Selection mode from Normal mode to the Simple mode in the Litematica main menu. Then all you need to do to make a selection is to left and right click with the "tool" (stick by default) to set the corners (while being in the Area Selection mode, which you can set in the bottom left of the Litematica menu). I would suggest setting the area name as well in the Area Editor though, because that name will become the display name of the schematic too.

Usually the Expand mode is faster/easier to use than the default Corners mode though... in the Expand mode you would right click to collapse the selection to the clicked point, and then left click on a block on all the edges of the area/build, and the selection will be expanded to include all of the clicked positions. By default you can switch between the Corners and ´Expandmodes withCtrl + M, or in the Generic` settings category.

For anyone that wants this now or in an older version, here's how I've done it.

I use a global schematics folder which I've placed in my Dropbox. I have multiple versions of Minecraft using MultiMC and have linked the schematics folder in each of these to my Dropbox. (I've linked screenshots, saves, and other folders as well)

The way to do this is by:

1. Start cmd.exe as an administrator (just press the windows button and type cmd, right-click, and start as administrator)
2. Type cd C:\Users\YOUR_USERNAME\AppData\Roaming\.minecraft to go to your Minecraft folder. Don't forget to replace YOUR_USERNAME with your actual username. It can be in another location if you're using Curse or MultiMC, but this is the default if you use the regular launcher.
3. Type mklink /D schematics LOCATION_YOU_WANT_TO_LINK_TO

For example in step 3 I type mklink /D schematics E:\Dropbox\Minecraft\schematics