This setting is used in combination with max_trading_pairs.
By default the bot does not count the PAIRS in your pending log towards your max traded pairs. Set this value to true and coins in your pending log will be counted towards max trading pairs.
If max is set to 2. And you have 1 coin in DCA and 1 coin in pending log. MAX trading pairs would have been reached.
max_trading_pairs = 2
max_trading_pairs_include_pending = true