Cruise control
 

Is there any way to add tour-bike like cruise control to a dyna?

I don't know if Dyna ECM's are set up to handle the throttle by wire system, which I think is required to use the OEM cruise option from Harley. I could be wrong.

no electronic cruise control option to my knowledge.
theres the throttle tension screw, and several bar-end/grip based systems.

I used to use a Vista Cruise Throttle Lock. But now I just use a Kuryakyn Throttle Boss.

If yours happens to have Throttle By Wire then yes. If not (and it probably doesn't) then your next best bet is some sort of throttle lock. It will hold your throttle at a certain position, but will not increase speed on a hill like cruise control will. It also will not disengage when you press brakes or clutch. There is one system that will disengage but it will not adjust speed, super pricey though at around $250 for the unit, and it involves splicing into wires and such.

if your talking about the brakeaway. cutting any cables.