Is possible to increment the vvvv overall precision? For what i need, 4 decimals are not enough.

internally vvvv calculates numbers with double precision. to display a number with more decimals use the FormatValue (String) node.

…where double precision means a precision with about 16 significant decimal digits.

is it possible to enter such double precision values manualy in an io box?

yes, just enter it…