There are a few elements which are not part of the default configuration of MarvinSketch but you can add it via the customization dialog.
These are:
To add new elements to the default
- Select View <Editor Style< Customize.
- Choose the tab which the element will be added to. Menus/Popups/Toolbars/Keymap.
- Choose the option from the dropdown list in the upper panel.
- Click Add at the 'Contents' section.
- Select a Category in the opening Add commands dialog box
- Select an enty (a single command or a group of them) 'Commands' panel . The 'Details' panel summerizes the main feature(s) of the selected command.
- Click Add.
- Click Close or add a new command.
Lone Pair Group
The toolbar and the menu can be customized to contain the Lone Pair Group tool.
Before adding this tool disable Automatic Lone Pair calculation (Preferences<Structure) to be able to set the lone pairs manually and make sure that View<Advanced<lone Pairs option is enabled.
Categories: Insert Lone Pair
Commands:
Increase Lone Pair
0 Lone Pair
1 Lone Pair
2 Lone Pair
3 Lone Pair
4 Lone Pair
Lone Pair Group
Radical Group
You can add the Radical Group 
toolbar to your MarvinSketch configuration.
Categories: Insert Radical .
Commands:
Radical switch
Monovalent radical and
Radical off
Radical Group
Free Radical Group
You can add the Free Radical Group 
to your MarvinSketch configuration.
Categories:Insert Free Radical
Commands.
0 radical,
1 radical
2 radicals
3 radicals
4 radicals
Increase Radical
Free Radiacal Group
The last one increases the number of radical electrons on the atom by one. The maximum number of radicals is 4.
Manual Atom Map
Categories: Structure
Commands: Manual Atom Map
Manual Atom Map can be added from Structure category.
Commnads: Manual Atom Map-Unmap Group
Unmap Atoms Manual Atom Map
Reaxys Generics
This template library contains the generic abbreviation commonly used in the Reaxys database.
Categories: Insert Template
Commands: Reaxys generics
Reaxys generics
Substitution Count
Categories: Atom Properties
Commands:
Substitution Count off,
Substitution Count as Drawn
0 substituent
1 substituent,
2 substituent
3 substituent
4 substituent
5 substituent
6 substituent