Polling frequency for playlist/manifest updates

Hi,
Is there a way to control the polling frequency/interval for HLS variant playlists / MPD manifests with the Bitmovin web player?
At the start of a live event, the manifests only contain a few segments, and it seems that the buffer gets starved quickly. However if the player was refreshing the manifest more frequently, it would find new segments.
I tried varying the segment duration and with shorter ones, the polling frequency increases as well. Is there a way of dissociating both?
I didn’t see anything obvious in the PlayerConfig.