Unfortunately, the filename template editor doesn't allow you to put spaces between fields like LR 1.0 did. If you try putting a space between fields, it removes them as soon as you move your cursor (at least on the Mac).
The workaround I've found is to go into the settings file directly and add them in. But it's inconvenient, because you have to find the file, edit it, quit LR and start it again to make a change.
For example, see the " " in the template below. That implements a space (exactly as the Filename template editor would have implemented in Version 1.0). You can't do that in the editor of Version 2.0 or 2.1. But you can add it manually in the template.
s = {
deflated = {
{
"",
{
value = "date_YYYYMMDD",
},
" ",
{
value = "custom_token",
},
" N1",
{
value = "image_filename_number_suffix",
},
"",
name = "Neils Renaming - Nikon",
presetType = "Naming",
},
"AgTokenPresets",
"restoreTokenFromArchivedState",
},
internalName = "Neils Renaming - Nikon",
title = "Neils Renaming - Nikon",
type = "Naming_Tokens",
version = 0,
}