I have recently submitted a changeset to add gate numbers in klia2. Although this seems easy, this terminal have a unique odd-even gate number assignments, which is unlike the Terminal 1.
Displayed map of klia2, before changeset
Displayed map of klia2, after changeset
Current displayed map of KLIA (Terminal 1), with gate numbers assigned
There is still work to be done in adding gate numbers to the other piers of the terminal, but I would be glad for others (especially the Malaysian OpenStreetMap community) to help in adding these as well. I am also planning to improve the Genting Highlands map in early 2019.