Maybe editing the S&M.ini file will enable more slots?
I was having a similar problem with the limit of fx chain slots for creating Audiosuite-like actions. It defaults to 4 and EpicSounds hipped me to the fact that simply changing the text "S&M_TAKEFXCHAIN=4" in the S&M.ini file to "S&M_TAKEFXCHAIN=50" was all I needed to do to raise it to 50 or whatever I wanted. The ini was set for 50 slots but I couldn't figure out how to create more fx chain slots, but this took fx chain slots from 4 to 50. I just looked around in the ini and couldn't determine which might increase the amount of track views slots (or even if one could) but hopefully someone much smarter than me can chime in with if it's possible to increase the those with a simple edit of an ini file.
edit: Maybe this thread has the pertinent info? This is what Pinknoise explains a few posts down:
"Regarding slot actions:
Search in the actions list for "slot" for a whole bunch of associated resource actions.
By default there are only a few actions per Resource/Bookmark type. For example the template slot actions may only show 01-04..., however you can have upto 99 slot actions per Bookmark. To have more actions do this..,
1)Close REAPER then locate and open the S&M.ini file in a text editor.
2)Look for the section [NbOfActions] then for example if you wanted more apply track template actions just change "&M_APPLY_TRTEMPLATE=" to whatever, upto 99 then save the file.
3)Restart REAPER and look in the actions list for the newly added actions.
And remember you can always create custom or cycle actions which can include slot actions."