If you put down "Tourist" on the form they'll issue you with the correct visa at CGK - note the 30 day limit AND the requirement that your passport still has 6 months to run - that may be 6 months when you leave - I've never taken the chance
Transfers are easy
You might want to be careful if you change your plans - I've heard of people having problems if they enter by air and leave by boat or land (that would be in Timor)
Generally at CGK & Bali the Immigrasi are used to handling herds of foreigners - the issues start in the smaller airports in the sticks
If you want a lifetime of pain try and extend your visa when you're in country without any local assistance............