Hello I suggest you to add an Action into PCB that takes multiple pins' diameter, adds some constant (4 for example) and puts the value into the diameter of the soldermask.
Meanwhile I send my perl code that does this with the whole schematic
in a pipeline (stdin-stdout) operation:
#!/usr/bin/perl
while(<STDIN>){
if (($l1, $diam, $l2, $mask, $l3) = /(\s*Pin\(\s*\S*\s*\S*\s*)(\S*)(\s*\
S*\s*)(\S*)(\s*.*)/)
{
$mask=$diam+4;
print $l1,$diam,$l2,$mask,$l3;
}
else
{
print $_;
}
}
