dA, => delete argument and drop the ','

[MarcWeber]

I find such mapping also deleting the , pretty useful when moving arguments first:

map dA, da,:let @* = substitute(@*, '^, \s*', ''", ''")<cr>

you may want to add it to the plugin file

[MarcWeber]

map dA, da,:let @* = substitute(substitute(@*, '^,\s*', '', ''), '\s*$', '', '')<cr>

even more useful also dropping trailing spaces. Thanks for the plugin

[MarcWeber]

Have a look and comment on this patch, please: https://github.com/MarcWeber/vim-commaobject/tree/rewrite-supporting-n-dropping