Just to clarify, as there seems to be some confusion about this. The pool has been mining BEL for over a month now, with a consequent increase in PPS ratio that applies to both LTC and DOGE (check your rewards history for details). There are no plans to start paying out BEL separately in the way that we do for DOGE, especially considering that BEL's block subsidy is scheduled to decrease considerably in a few weeks.
at wich date this 'test' with BEL was done?
Not sure what you mean by "test". The increase in PPS rate has applied to all users, without need to take any action, since early September.
never saw any ability to add a BEL wallet or ever got BEL for my shares here
As per my message above, the pool never paid out BEL separately in the way it does for DOGE. Instead, the added profitability from BEL contributes to a higher PPS ratio for LTC and DOGE.