tradeRX,
Yes
Yes (T&S upticks green, downticks red: is that wht u mean?)
Yes
Comstock (i believe) for real time; Iverson Fin. for historical
Yes
The only limit to the number of charts and other windows is the speed of your PC. My main working set-up has two linked groups (each with large 1 min chart, 3 mo chart, T&S, L2) also 1 min comp, 6 addn'l 1 min charts, and a third linked group with 1 min, 5 min (5 day), and 3 mo charts, plus a few other charts minimized at the bottom of the screen. The only drawback to having this much in a workspace is that it takes about 20 sec. to close/open so I use only one workspace during the day but various workspaces (organized by industry groups) after hours.
You link charts and other windows with what QQL calls 'symbol groups'. There are 3 (only) symbol groups available per workspace but any number of windows can be linked in each group.
Another nice feature is 'link packs' (not the same 'link' mentioned above). Link packs are pre-set links to specific web pages. Two clicks on a symbol anywhere on your workspace will enter that symbol into (and open) Yahoo's quote page or ViWes short interest page or dozens of others I haven't tried. You can also create your own link packs and edit those supplied by QQL.
One last comment, QQL is visually much nicer to look at than the others I have seen (screenshots, trials, etc), FWIW. Also, as I have mentioned elsewhere, the default config. proudly displays about a dozen bells and whistles but these are easy to turn off then they leave you alone. I go bare bones with just charts, T&S, L2.