diff --git a/slic/core/acquisition/broker_client.py b/slic/core/acquisition/broker_client.py
index 4c521693..6409f625 100644
--- a/slic/core/acquisition/broker_client.py
+++ b/slic/core/acquisition/broker_client.py
@@ -10,6 +10,7 @@ import numpy as np
 
 from slic.utils import xrange, tqdm_mod, tqdm_sleep
 from slic.utils import json_validate
+from slic.utils.printing import printable_dict
 
 from .broker_tools import get_current_pulseid, get_endstation
 
@@ -304,12 +305,13 @@ class BrokerConfig:
         self.client_name = client_name
         self.set(None) #TODO: sensible defaults?
 
-    def set(self, output_dir, detectors=None, channels=None, pvs=None, scan_info=None):
+    def set(self, output_dir, detectors=None, channels=None, pvs=None, scan_info=None, **kwargs):
         self.output_dir = output_dir
         self.detectors = detectors
         self.channels = channels
         self.pvs = pvs
         self.scan_info = scan_info
+        self.kwargs = kwargs # unknown arguments will be forwarded verbatim to the broker
 
 
     def to_dict(self, run_number, start_pulseid, stop_pulseid):
@@ -345,6 +347,12 @@ class BrokerConfig:
         if self.scan_info:
             config["scan_info"] = self.scan_info
 
+        kwargs = self.kwargs
+        if kwargs:
+            header="the following unknown arguments are forwarded verbatim to the server"
+            print(printable_dict(kwargs, header=header))
+            config.update(self.kwargs)
+
         return config
 
 
diff --git a/slic/core/acquisition/sfacquisition.py b/slic/core/acquisition/sfacquisition.py
index 5e9ade5e..a61103f5 100644
--- a/slic/core/acquisition/sfacquisition.py
+++ b/slic/core/acquisition/sfacquisition.py
@@ -39,7 +39,7 @@ class SFAcquisition(BaseAcquisition):
         self.current_task = None
 
 
-    def acquire(self, filename, data_base_dir=None, detectors=None, channels=None, pvs=None, scan_info=None, n_pulses=100, n_repeat=1, is_scan_step=False, wait=True):
+    def acquire(self, filename, data_base_dir=None, detectors=None, channels=None, pvs=None, scan_info=None, n_pulses=100, n_repeat=1, is_scan_step=False, wait=True, **kwargs):
         if not is_scan_step:
             run_number = self.client.next_run()
             print(f"Advanced run number to {run_number}.")
@@ -74,7 +74,7 @@ class SFAcquisition(BaseAcquisition):
         bschs.check()
 
         client = self.client
-        client.set_config(n_pulses, filename, detectors=detectors, channels=channels, pvs=pvs, scan_info=scan_info)
+        client.set_config(n_pulses, filename, detectors=detectors, channels=channels, pvs=pvs, scan_info=scan_info, **kwargs)
 
         paths = SwissFELPaths(self.instrument, self.pgroup)