Is there any way to set the Trace bitmap brightness threshold to another default value so that you don't have to always change it from 0.45?  I tried making a template but that doesn't save that parameter.

https://i.imgur.com/3bRYOo9.png

Thanks

Through much digging, I found where the 'Brightness threshold' parameter is kept.

1. Close Inkscape.

2. Open 'C:[path to]\Inkscape\share\inkscape\ui\dialog-trace.glade' in a text editor (Notepad++).

3. Search for 0.45

  <object class="GtkAdjustment" id="SS_BC_T">
    <property name="upper">1</property>
    <property name="value">0.45</property>
    <property name="step_increment">0.01</property>
    <property name="page_increment">10</property>
  </object>

4. Change to the desired value and save.  I always start with 0.95 and want it as default.

    <property name="value">0.95</property>

5. Save file.
 

Something else I wanted to come in as default was the: Spacing between baselines:

The default is 1.25, but I wanted it to default to 1.05.

Open: C:\Users\[your user name]\AppData\Roaming\inkscape\preferences.xml

Change 1.25 in the line below to 1.05 (or 1.15 or what ever you want spacing to be):

style="font-family:Arial;font-size:24px;line-height:1.05;letter-spacing:0px;word-spacing:0px;-inkscape-font-specification:'Arial, Normal'"

Save file. 

You can probably change the default font also by changing the word from Ariel in both places to whatever you want the font to be.