We understand that you would like to configure thresholds for ESX Memory and VMware CPU inside Memory and CPU tabs. Unfortunately, as of now, it is not possible to configure such thresholds inside those tabs.
However, you can configure such thresholds by navigating to Admin > Configuration Profiles > Threshold and Availability > Default Threshold - VMWAREESX.
Also, regards to your query on Datastore and VM Disk's latency metric, we are developing new monitor types focused on Datastore and Resource Pools in the VM Infrastructure. These monitors are currently in our testing phase and you can expect it to be available in Site24x7 before end of May.
Thank you so much for your feedback. Feel free to get back us, we will be glad to assist you further.