Beacon regulation is turned on in all my deployments, its a good 'addition' to the base featureset that was added in the ARM 2.0 feature additions some time ago. Please, by all means, activate... no downside.
As for CSA, that has been around for years, and can be activated with little potential risk. LIttle I say? What I mean by that is that clients that don't support the management messaging that is used for this feature (and other related ones that need to be enabled when you 'check' the CSA box) will refuse to connect to the network.
So what is the risk on CSA? In my experience, the last time I saw a client get 'upset' at a CSA message was about 3 years ago. I think you are sufficiently (as in 99.99%) safe that CSA will not cause you problems (on anyone's WLAN) these days. The benefit of CSA is to advertise to all clients that the AP is changing channel in 900 msec, 800msec, 700msec.....NOW ! A good thing to help the client's driver get 'ready' itself.
Hope that helps...