Option to exclude monumentsSuggestion
Is there any option to exclude certain monuments? for example that the user could only TP towards small monuments only or only specific ones that the admin whitelisted?  
Thank you for your suggestion. Should I make this list per-permission, or per-user or something?
hmm, I'm not the best at coding, so I'm having some suggestions. not sure what could be possible and what not. 

1. GUI hud
as an admin: From here, the admin is able to enable or disable the monuments to be used as a TP option ( similar like permissions plugin )
as a player: the command to open up the list ( as you have already ) that will include the allowed TP's towards the monuments that have been assigned towards the players. 

2. The oldschool way
As an admin: you have to find the entity name of the monument to exclude it in the monuments TP list. The number or entity name can be used for blocking the TP in the list. (another possible option is to look at it and just /mtp_exclude, but I dont know what's best )

As a player: open up the list command, those that can be TP's towards, will have a green monument name and monuments that are not allowed or blocked or whatever people may call it these days :P so that it indicates that the user cannot use that monument as a TP option.