1) You can only shoot once with one weapon in the shooting phase unless something lets you do otherwise. Pistoleer only works with a brace of pistols (not one-handed shooting weapons) so that won't do it
2) Quick Shot is only able to be used on either bows or crossbows, except crossbow pistols; it won't work with blowpipes.
In my group we are thinking of giving blowpipes the following special rule:
Small: Due to its small size and negligable weight the blowpipe does not count as against one's limit of ranged weapons.
Noone takes them at all because they are just that poo.