Of course, you can disable this feature and SimpleEdit will always start with your default definition. You can change the definition, the encoding and the line ending at any time.
How to edit and change the default definition is described here.
Also depending on the selected definition, you can navigate by keyboard thru your code and select the next or previous symbol/function.
How to show the navigation menu
> Menu > View > Symbols (or Functions)
Shortcut: cmd+'
How to navigate to a symbol/function
Type line number and press return
How to navigate to the previous symbol/function
> Menu > Edit > Previous Symbol (or Function)
Shortcut: cmd+alt+up
How to navigate to the next symbol/function
> Menu > Edit > Next Symbol (or Function)
Shortcut: cmd+alt+down
Probably the best thing about SimpleEdit is its customizable command menu. You can create your own for every definition you use and it does not make use of any sub menus - so you really can use it just by keyboard and you can add your own shortcuts for every menu item. No matter if it is just a snippet, a template, a simple link, a script or even your own command line commands and your own URL requests. How to edit and change those commands is described here.
How to access the command menu
Menu > View > Commands
Shortcut: cmd+\