Profile Batch Update maximums are low and sould be configurable

When using the update in batch feature, there are two maximums in Profile batch update defined by two constants in CRM/Contact/Form/Task/PickProfile.php :

/**

• maximum contacts that should be allowed to update
  *
  */
  protected $_maxContacts = 100;

/**

• maximum profile fields that will be displayed
  *
  */
  protected $_maxFields = 9;

These values are very low and limits the usefulness of the feature.

3 improvements could be made :

1. Raise those values

1000 field (1000 contacts x 1 field) takes about 15 sec to load and render. 50 sec to update all contacts.
5000 field (1000 contacts x 5 field)takes about 30 sec to load and render. 60 sec to update all contacts.

New values could be :
_maxContacts = 600 (also in ./CRM/Contact/Form/Task/Batch.php, but not used)
_maxFields = 15 (be aware this value is set in more than one place in the code)

2. Make those values configurable

Maybe in admin/setting/misc

3. Use a paging mechanism to support unlimited number of contacts

This would be really cool, but is much more work.