How about player configurating the Jetpack when you rightclick it? (Open a gui with all mode options)
Actvating multiple mods stacks extra drain percentage.
For example :
Safe landing + rocket mode = 1x + 0.2x + 4x = 5.2x
Safe landing + Horizontal mode + Creative Flight = 1x + 0.2x + 1.5x + 0.5x = 3.2x)
And add another option:
(electric only) : Allow Drainage of Quantum suit energy (75% efficient) to provide extra internal storage
(fuel only) : Allow the usage of UUM in inventory to refill jetpacks (1 UUM refills 3/8 jetpack)