Staffs, polearms, endcaps and butt spikes

[Flowergarden]

Hi, I'm here to overthink for a little bit.
Some time ago I made a small weapon customisation system based on Low Tech Companion 2 rules. It's very gamist, (balance more important than realism). So most of the weapons are sticks with modifiers.
Problem I have here is Staffs are TL0, but for some reason have metal endcaps. Okay, maybe it's a legacy issue. But at the same time, polearms used as staffs have the same damage. Most polearms don't have endcaps, as far as I know. But many polearms have buttspikes, and it is an option in LTC2. Problem is, what about blunt version and staff.

Can I combine them? Can I put endcaps/flanges on polearms? And what damage it will be.

The other question would probably be: why you need glaive if you have dueling halberd? No not minST, it's not enough.