I also read Moth Smoke by Mohsin Ahmed and liked it. I've read Blasphemy by Tahmina Durrani and enjoyed reading it; pretty scandalous book that is supposedly based on a true story.
I've read books by Bapsi Sidhwa.
Don't know of any other Pakistani authors. But I'm a Pakistani and aspire to be an author one day, InshaAllah. It's been a fantasy of mine for quite some time.
As far as desi authors are concerned, I've read several books written by Indian authors that I've enjoyed.
Interpretor of Maladies/ Jhumpa Lahiri Serving Crazy with Curry/ Amulya Malladi The Mango Season/Amulya Malladi Song of the Cuckoo Bird/ Amulya Malladi Sister of My Heart/ Chitra Banerjee Divakaruni The Unknown Errors of Our Lives/ Chitra Banerjee Divakaruni Koyal Dark, Mango Sweet/ Kashmira Sheth
I picked up a few books in Pakistan, the most horrible book/author I ever had the (dis)pleasure of reading was Nisha Minhas. bahhh!
Color of Mehndi--Nausheen Pasha zaidi.. amazing story
Shahnaz-- by Hiro Boga.. slow moving but worth a read nonetheless