Hi, Jouke.

When it comes to setting up available values for Editing with our built-in options,

for String Columns,

you can go in a column's settings/Data tab,

and change from 'Read from table on page load' , to 'Define values list' or 'Use values from another wpDataTable ( foreign key)'

If you set to "define values list",

then you can set  any values you need, and only those values will be available,

but for Editor Type, for this to work - you can set "Single value selectbox", or "multi value selectbox".

Then, if i try to edit existing value for that column,

it only allows me to pick from defined values.

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Or if you make a Foreign Key relation with a column from another table; 

in that case it will pull all the available values from that other table's column.

So if you set up only values you need there ( for example between 0 and 100)

 - the user is limited to only a 'single value selectbox' Editor Type, 

and they can only choose from values you set in that other table's column.

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Let me know if that helps.