.htaccess for rewrite url affecting web-dev folder - apache

Question

Okay there is 2 questions,
First, I'm new with htaccess and have a lot of problem figure out how to make good Rewrited URL for google SEO so i've made this :
Options +FollowSymlinks
RewriteEngine on
### [... other language ...]
### English product URL
# Product page : (url/en/products/items-1.html)
RewriteRule ^([a-z]+)/[P-p]roducts/item-([0-9]+)\.html$ produits.php?lang=$1&art=$2 [L,NC]
# List of categories of a division (url/en/products/items-1-1.html)
RewriteRule ^([a-z]+)/[P-p]roducts/item-([0-9]+)-([0-9]+)\.html$ produits.php?lang=$1&idc=$2&catd=$3 [L,NC]
# List of subcategories of a categorie (url/en/products/items-1-1-1.html)
RewriteRule ^([a-z]+)/[P-p]roducts/item-([0-9]+)-([0-9]+)-([0-9]+)\.html$ produits.php?lang=$1&idc=$2&catd=$3&catt=$4 [L,NC]
# List of sub-sub-categories of a sub-categorie (url/en/products/items-1-1-1-1.html)
RewriteRule ^([a-z]+)/[P-p]roducts/item-([0-9]+)-([0-9]+)-([0-9]+)-([0-9]+)\.html$ produits.php?lang=$1&idc=$2&catd=$3&catt=$4&catq=$5 [L,NC]
### Mod Rewrite to make url more friendly EN
RewriteRule ^([a-z]+)/[B-b]ecome-a-[C-c]lient client.php?lang=$1 [L,NC]
RewriteRule ^([a-z]+)/[C-c]ontact-[U-u]s contact.php?lang=$1 [L,NC]
RewriteRule ^([a-z]+)/[O-o]ops erreur.php?lang=$1 [L,NC]
RewriteRule ^([a-z]+)/[I-i]ndustrial-[D-d]ivision industriel.php?lang=$1 [L,NC]
RewriteRule ^([a-z]+)/[C-c]art panier.php?lang=$1 [L,NC]
RewriteRule ^([a-z]+)/[S-s]earch recherche.php?lang=$1 [L,NC]
RewriteRule ^([a-z]+)/[H-h]ealt-[D-d]ivision sanitaire.php?lang=$1 [L,NC]
RewriteRule ^([a-z]+)/[H-h]ome index.php?lang=$1 [L,NC]
### Compression Mod
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/php
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
## [... errors page ...]
The problem now is that if I would reach something for developpement purpose I can't do it
Exemple : I copy the whole website into a folder named work a the root of the domain so the url would be
www.website-url.com/work
at this point everything is fine I can access this part, but if I would access products.php I just can do it... I know that I can't reach it with the rewrite like www.website-url.com/work/products/items-1.html but I should be able to access it directly no ?
My second questions is that I would use compression for my server to make the website load more faster for client because I have a lot of javascipt working with jQuery a lot. But I can't make it work, I've checked with online tools and never pass compression test.
Thanks for your help !