Delete: possible  

Modify:  should be avoided as far as possible (support subject to fees, no update capability).

Justification:

•Problems are difficult to verify or their cause is difficult to track down (complex with rules that can cancel each other out).

•It cannot be discerned which rules come from VertiGIS and which come from extensions, since no ID or naming convention can be defined due to Esri’s technical requirements.  

•An update has not yet been ensured. If an update is implemented, the rules would simply be reinserted with the update to the new version.

Create:  should be avoided as far as possible (support subject to fees, no update capability).

Same justifications apply as for Modify.