Hi,to answer your question --
1. No, the dominant owner (owner of landlocked property accessing neighbours property for way) cannot by merely altering or adding to the dominant heritage substantially increase an easement.
Where an easement has been granted, its extent shall be proportionate to the extent of the dominant heritage. If the dominant heritage is increased by alluvion the easement is proportionally increased and if the dominant heritage is diminished by dilluvian the easement is proportionally diminished. no is meant is affected by any change in the extent of the dominant or the servant character. Except these situations, in no circumstances can easement be changed.
2. With mutual consent, the path of easement can be revised. The dominant owner can change the rpath of easement as long as he does not impose a burden on the serviant heritage.
3. minimum widdth for ingress and egress to the property should be provided.
I hope this has answered your question.
Have a nice day!