I can't think of any way this feature could be abused - and if it helps explorers, fantastic.
As far as the feature itself - there's a lot of folks who utilize llTeleportHome and llEjectFromLand for
blacklist scripts. Unless you're on that parcel's blacklist, it wouldn't affect you or your vehicle. Its
whitelist systems (eject everyone but allowed individuals) that are the big navigation problem. Unfortunately, I dont see an easy way to differentiate the two.
This means that you're probably going to detect more 'script danger' than you really need to be concerned about, and possibly have to navigate around more parcels than neccesary.
Other than that, I can't see a problem with the idea