Keeping to Division level I don't see how we get much beyond 30 inf.+cav. territs. The leitmotif for this map appears to be "simplicity" and the current 29+2+3 territs supports that, though I think my suggestion for 29+3+6 territs also keeps the simplicitly while improving game play.
Speaking for myself I like this map and would like to see a series of such "simple" Napoleonic battle maps including one for Waterloo.
But he can explore some of divisions, and these is best solution for creating more territory.
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LA GRANDE ARMEE
26.NAPOLEON
-Garde Imperiale Marshal Bessiere
1.Infantry Of the Guard
2.Cavalry of the Guard
3.Artilery of the Guard
-I Corps Marshal Bernadotte
4.Advanced Guard
5.1 st Division General Raffiniere
6.2nd Division General Drouet
7.Light Cavalry General Kellerman
-III Corps Marshal Davout
8.2nd Division General Friant
9.4th Dragoon Division General Bourcier
10.III Corps Artillery
-IV CORPS Marshal Soult
11.1st Dicvision General Saint-Hilarie
12.2nd Division General Vandamme
13.3rd Division General Legrand
14.Light Cavalry Division General Margaron
15.IV Corps Artillery
-V Corps Marshal Lannes
16.1st Division General Caffarelli
17.3rd Division General Suchet
18.Light Cavarly Division General Trelliard
19.V Corps Artillery
20.Grenadier Division General Oudinot
-Cavalry Reserve Marshal Murat
21.1sr Heavy Cavalry Division General Nansouti
22.2nd Heavy Cavalry Division General d'Hautpoul
23.2nd Dragoon Division General Walther
24.3rd Dragoon Division General Beaumont
25.Light Cavalry Brigade General Milhaud
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ARMY OF THIRD COALITION
1.Kutusov
2.von Liechtenstein
-The Russian Imperial Guard Grand Duke Constantine
3.Russian Infantry of the Guard
4.Russian Cavalry of the Guard
-Advanced Guard of the Tsar Army General Bagration
5.Russian Infantry
6.Russian Cavalry
-Advanced Guard of General Buxhowden
7.1st Infantry Brigade General Carnevile
8.1st Cavalry Brigade General Nostitz
9.2nd cavalry Brigade General Lichtenstein
-First Column General Dokhturov
10.1st Infantry Brigade General Lewis
11.2nd Infantry Brigade General Urusov
-Second Column General Langeron
12.1st Infantry Brigade General Olsuvev
13.2nd Infantry Brigade General Kamensky
-Third Column General Przebyszewski
14.1st Infantry Brigade General Muller
15.2nd Infantry Brigade General Selekhov
-Fourth Column General Miloradovich
16.Advanced Guard Colonel Monakhtin
17.1st Infantry Brigade General Wodniansky
18.2nd Infantry Brigade General Rottermund
19.3rd Infantry Brigade General Jurczik
-Fifth (Cavalry) Column General Prince Johann von Lienchensteine
20.1st Cavalry Brigade General Caramelli
21.2nd Cavalry Brigade General Weber
22.3rd Cavalry Brigade General Gladkov
23.4th Cavalry Brigade general Uvarov
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Like you see i create 26 France and 23 Coalition Units(territory).OFcourse need more research(from your side)to create 3-4 artillery units from Coalition side.