Parameters for building custom maps

[KingOfKyuss]

I have a few quick questions, feel free to opine...

1) Do you think it is best to design your maps where both sides are more or less 95-100% symmetrical for both sides, leading up to the center? i.e don't have one side with more elevation, more access to glyphs, etc. Why or why not?

2) How many glyphs do you include per map? I have generally been including about a half dozen. Is that too many/not enough....?

3) What about elevation? After perusing this site, I notice a lot of the maps are relatively flat, except for castle walls, glaciers, trees, etc. Is it bad to have maps where there are hexes that reach 8 or 9 in height?

4) What are some popular scenario ideas for maps that are balanced, aside from just doing a straight up "kill em all to win" or "capture the flag" scenario?