Yes, you can merge cells in the sheet list table, well, kind of. You are actually merging the cells, then overiding the text, just like overiding the text in a civil 3d label if you need to.
Click the table, then window select the cells to merge.
Right click and find the Unlock feature to unlock the cells.
Right click again and now the Merge feature is not grayed out anymore.
Message: "Only data in top cell will be displayed..."- OK.
Click the cell/right click the text/insert/edit data field.
At the top where it says which text to display, type in your sheet number range. It's still linked to your file, but it acts like a text overide in a civil 3d label.
If you update your sheet list (right click/update sheet...), it will notify you that you have overidden cells in the table and asks if you want to overide those cells with the new data. If you say yes, it will overide your changes and display your entire list again. Say no and it won't.
Hope this helps. You then do the same to your names.