work in brunei, weekend miri, limbang --- wohoo !

it is the singapore of borneo 
miri people = jb people 

Actually possible. Tax treaty is only intended to avoid double tax. There is no international law to avoid excess income tax. Thats why big countries like china and US practice global tax.

However bolehland adopts territorial tax system ie it will only tax bolehand income. To tax foreign income, this will need to shift system which is quite drastic. Something similar like beps 2.0 already making waves globally and not easy to implement.

If bolehand move to global tax, this will only result in more emigration to sinkie and other richer countries. not to mention ineffective.