Message Bundling in TUNNEL mode

Hi, I'm using JGroups v3.6.4 and it is working great. I have a quick question –

TUNNEL.java's 'send' method clearly says – "// we don't currently support message bundling in TUNNEL"

If I wish to use 'SenderSendsWithTimerBundler' (i.e., bundle and send when queued messages are 64K or 20ms have passed), could you please let me know what options I have? E.g., whether I need to use a later version that supports bundling with TUNNEL or is there some other option. Thanks!

Regards,
-Bharad