Problem:    The swapmous plugin has to be copied or sourced to be used.
Solution:   Turn it into the swapmouse package.

Problem:    The editexisting plugin has to be copied or sourced to be used.
Solution:   Turn it into a package.

Problem:    The justify plugin has to be copied or sourced to be used.
Solution:   Turn it into a package.

Problem:    The Dvorak support is a bit difficult to install.
Solution:   Turn it into an optional package.

Problem:    When help exists in multiple languages, adding @ab while "ab" is
            the default help language is unnecessary.
Solution:   Leave out "@ab" when not needed. (Ken Takata)

Problem:    Completion doesn't work well for a variable containing "#".
Solution:   Recognize the "#". (Watiko)

Problem:    When writing buffer lines to a pipe Vim may block.
Solution:   Avoid blocking, write more lines later.

Problem:    channel_get_all() does multiple allocations.
Solution:   Compute the size and allocate once.

Problem:    Win32: waiting on a pipe with fixed sleep time.
Solution:   Start with a short delay and increase it when looping.

Problem:    When reading JSON from a channel all readahead is used.
Solution:   Use the fill function to reduce overhead.