so this is a 5NXT to 10 NXT per trade and will discourage small orders and also those annoying bots that bid 1 satoshi higher, they wont be able to do that as the fee per trade is too expensive.
Yes, yes, yes.
Also, consider limiting decimal places (this is coin specific)...
For example, BTER traded NXT to only 7 decimal places and created the most liquid market...
You eliminate the NXT "satoshi jumpers" when the minimum increment is 10 satoshi.
For BTCD there is absolutely no reason to go beyond 5 decimal places:
bid: 0.00400 ask: 0.00401
Note the 6th decimal place is only useful to market manipulators.