Express Air (737/Dornier 328) employs foreigners. Mandala do also but as far as I know they are only TRI/TRE. There are a number of foreigners flying Part 91/135 ops also. No more than 100 I would imagine with the bulk of those working for one company. Thats not including Missionary pilots (MAF/AMA/Yujasi etc).
Lion Air supposedly have received permission from DGCA to employ foreigners as they are struggling to crew their steady stream of 737-900ER's. There was discussion on here about the kind of contracts that were on offer. Also they really need to pick up their act... shades of Adam Air.