We chose to provide as complete a solution as is possible in one font for the display and publication of phonetic text using the current IPA, but without the extras. All the extras are included in the full release of SIL Encore Fonts. Due to font size limitations, we chose to include only the current IPA characters in the fonts. You will then have to kern the diacritic and next character farther apart by an equal amount to ensure that the next character is spaced correctly. You might even be able to set up a macro to do this on command.
Line spacing can be problem when mixing typefaces.
Hence any line containing an IPA character will have its automatic line spacing altered. Many programs, however, allow you to control the line spacing manually. When I use diacritics, the end of the line gets chopped off and my cursor is in the wrong place. This is sometimes caused by a screen driver that does not fully support Windows 3.1 or Windows 95. Try switching to the standard VGA driver included with Windows.