I assume your drawing is showing two decimal places because that's the setting chosen at Tools > Options > Document Properties > Units. Please see the screenshot below from How do I change my units from inches to mm (or vice versa)?.
Why not use a hole table?
You won't need to create properties or add linked notes (with all of the inherent dangers of this approach).
you can add all the confusing dims to the drawing and add them to the notes by clicking on them with out making them custom properties, then hide them.
Another thing that I used to do would be to a process drawing, when things got crowded. Show only one size hole per view, so that the machinist could program one tool at a time. Depending on the # of holes some views would or could have multiple sizes.
Then the hole table came out and that there sure would be the way to go but I had moved on from those kind of parts by then.
The other option. make the drawing view larger on a larger size paper.
I am going to add to what David said.
If you choose to not use the hole table you can place the dimensions that are required. Then start a note pointing to the hole. With the note active you can select the desired dimensions and type additional information as needed. After the note is created you can select the dimensions and hide them and you now have a note that is linked to the dimensions without creating the properties.
This is how I do a lot of dimensions for slots and things. But if you are locating holes, the hole table is probably your best choice. And as Glenn said the decimals would be set in the options menu.