Is it possible to use multiple proxies simulatneously?

I have access to four different proxy servers within my college. (Squid I think)
Each proxy has limitations on the number of simultaneous GET requests (4 I think. When I set anything higher
in Firefox images don't load, etc..) and allows only http and https traffic.  I was thinking if it was possible to use
all/at least more than one proxy at a time to improve speeds.
Does wget/aria2c have this capability? To download segments of a file from different proxies simultaneously instead of just one?
I'd seen the manpages but as far as I can tell they use only one proxy server at a time (usually through environment variables)
In fact I'd be happy if I were able to get good download speeds for pacman updates using multiple proxies.
I've heard of network interface bonding but it looks like a lot of trouble to set it up (kernel recompilation! )
Is http://www.cyberciti.biz/howto/question … -howto.php the way or is there any other?
Just thought I'd know all possibilities before compiling kernels and stuff..

I don't know if aria2 can use multiple proxies simultaneously, but if you want to download packages quickly through multiple proxies, you could do the following in a script:
generate a metalink for your packages using powerpill
split the metalink into separate metalinks with roughly the same download volume in each one
launch separate instances of aria2c for each metalink, each set to a different proxy
If you try this, don't forget to change the connection settings in the powerpill configuration file (or when you split the metalink) to avoid more than 4 connections per proxy.

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