New country

We finally agreed to allow a new country: Darfur. There existed a Sultanate of Darfur which gained his independance from under English-influenced Egypt for a few decades. These coins are highly rare and only a few types exist. They're listed in Krause as well.

Are the 2 types in the catalog the only ones that exist?

No. According to NGC World Coin Price Guide, based on Krause, 5 types of coins does exist. 3 of them are of 1 Qirsh (Piastre). There is also a 5 Qirsh (Piastres).

Still more than Tonkin

Since you added Darfur, can you finally merge Burma and Myanmar, merger Spitsbergen and Svalbard, and remove Tanganyika?
Burma and Myanmar, and Spitsbergen and Svalbard share the same coins, so I propose to the leadership council/decision makers that they have one listing each, such as Burma/Myanmar and Spitsbergen/Svalbard.
Tanganyika is Tanzania and should be removed from the country list unless Tanganyika specific coins are found.
This should reduce the country list to 404.

There is no reason to delete them. Look well to the URLs, they're the same. Moreover these double namings have no influence on the country count. Anyway they keep a reasonable use as there are still people using either Burma and Myanmar for the same country, as well as Spitsbergen is the German name of the Svalbard archipelago, also used to name the main island hosting the various settlements which minted coins.

Spitzbergen and Svalbard are there, essentially, because the coins say Spitsbergen but the official name of the place is Svalbard.
Myanmar is the modern official name for Burma; it is unpopular because it is too associated with the military junta ruling the country, and in any case is a bit obscure.
Not mentioned is Great Britain and United Kingdom - for obvious reasons, both should be included, even though they're obviously the same country. (Though not England - that's the pre-1707 country.)
I have no idea why Tanganyika is here, however.

The real weird one is Bourbon Island (which is a redirect to Reunion, unlike Isles de France et Bonaparte, which isn't despite referring to the same place).

I only know that Tanganiyka is the ancient name of the Tanzania mainland (please note the name Tanzania is made from a contraction of Tanganiyka and Zanzibar, however, Zanzibar has a separate listing as minting its own coins when separate territories)

To tell you the truth, there is a difficult issue concerning Réunion, so I'll make it longer.
Initially, France owned both Mauritius and Réunion, respectly named in old French Isle de France and Isle Bourbon. After the French revolution, there were some name changes, but the most known on is the replacement of the Réunion name: Isle Bonaparte. Both islands had a common coinage, despite the pre-revolutionary coinage remained in Réunion listing.
After the Napoleon fall, the Bourbon family was restored as well as the Réunion's name. However France lost the other island renamed Mauritius by the British to erase any link to France. And later, the Bourbon Island changed its name again and finally became Île de la Réunion.